symbiosis
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C1 noun /ˌsɪmbɪˈəʊsɪs/

symbiosis

Meaning
A mutually beneficial relationship between different people or groups.
Example
The symbiosis between the two companies led to mutual growth.
C1 noun speɪst ˌrep.ɪˈtɪʃ.ən

spaced repetition

Meaning
A learning technique that involves reviewing information at increasing intervals to improve long-term retention.
Example
Spaced repetition helps in long-term memory retention.
C1 noun /ˈskrɪmɪdʒ/

scrimmage

Meaning
A practice game or informal match, often in sports, especially football.
Example
The team had a scrimmage before the official season started.
C1 verb /ˈsnɪkər/

snicker

Meaning
to laugh quietly in a disrespectful or mocking way
Example
The students snickered when the teacher made a mistake.
C1 noun /ˈskaɪ.lɑːrk/

Sky-Lark

Meaning
a small brown bird known for singing while flying high in the sky
Example
The skylark sang beautifully as it soared above the meadow.
C1 noun /ˌstætɪˈstɪʃən/

statistician

Meaning
A person who specializes in collecting, analyzing, and interpreting numerical data.
Example
The statistician presented the survey results with great clarity.
C1 verb /ʃɪə/

shear

Meaning
to cut the wool off a sheep or to cut something with sharp tools like scissors or shears
Example
The farmer will shear the sheep in the spring.
C1 adjective /stiːpt/

steeped

Meaning
Completely surrounded by or filled with a particular quality, influence, or experience.
Example
The town is steeped in history and tradition.
C1 adjective skiˈmæt.ɪk

Schematic

Meaning
Presenting some framework or concept briefly
Example
The engineer provided a schematic diagram of the project.
C1 verb /ˈspɪərˌhɛd/

spearhead

Meaning
to lead or initiate an action, project, or movement
Example
She spearheaded the campaign for environmental awareness.
C1 noun/verb /skɜːrdʒ/

scourge

Meaning
A source of great pain or punishment; to whip or inflict suffering on someone.
Example
Disease and poverty remain a scourge in many regions.
C1 noun səˈlɪnɪti ɪnˈtruːʒən

salinity intrusion

Meaning
The movement of salt water into freshwater areas, typically affecting coastal regions.
Example
Salinity intrusion affects coastal regions.
C1 noun /slæɡ/

slag

Meaning
Stony waste matter separated from metals during the smelting process.
Example
The factory dumped the slag near the river.
C1 noun, verb /ˈskʌf.əl/

scuffle

Meaning
a short, confused fight or struggle; to engage in such a fight
Example
Two players scuffled on the field after the foul.
C1 noun səˌfɪs.tɪˈkeɪ.ʃən

sophistication

Meaning
High level of complexity or refinement.
Example
The sophistication of modern AI technology is remarkable.
C1 verb /slɪŋk/

slink

Meaning
to move quietly and secretly, often to avoid being noticed
Example
The cat slunk into the room without making a sound.
C1 verb /ˈswɪndl/

swindle

Meaning
to cheat someone out of money or possessions by deceit
Example
The con artist tried to swindle the old man out of his savings.
C1 noun /ˈsɜːrmən/

sermon

Meaning
A religious discourse delivered by a preacher, often offering moral instruction or spiritual guidance.
Example
The pastor gave a moving sermon about compassion and forgiveness.
C1 adjective /sɪˈkluːdɪd/

secluded

Meaning
Placed apart from other people or things; private and quiet.
Example
They spent their vacation in a secluded beach house.
C1 adjective /səkˈsɪŋkt/

succinct

Meaning
Briefly and clearly expressed; characterized by clear, precise expression in few words.
Example
His speech was succinct and impactful.
C1 noun /ˈskævɪndʒər/

scavenger

Meaning
an animal or person that feeds on dead or discarded material
Example
Vultures are natural scavengers that clean up the environment.
C1 verb/noun /skaʊl/

scowl

Meaning
To frown in an angry or bad-tempered way.
Example
She scowled when she heard the unfair remark.
C1 verb /səbˈsɪst/

subsist

Meaning
To maintain or support oneself, especially at a minimal level.
Example
Many villagers still subsist on fishing and farming.
C1 noun /ˌsəʊ.ʃi.əʊˈek.ə.nɒm.ɪk ˈprɒɡ.res/

socioeconomic progress

Meaning
Advancement in both social and economic conditions of a society or community.
Example
Socioeconomic progress uplifts marginalized communities.
C1 noun /ˈskælpəl/

scalpel

Meaning
A small and extremely sharp bladed instrument used for surgery and dissection.
Example
The surgeon carefully used a scalpel to make the first incision.
C1 noun /ˈʃær.ən fruːt/

Sharon fruit

Meaning
a sweet orange persimmon fruit that can be eaten when firm
Example
The Sharon fruit is sweet and can be eaten like an apple.
C1 adjective /ˈstraɪ.dənt/

strident

Meaning
loud and harsh; presenting a point of view in a forceful way
Example
His strident voice made the debate uncomfortable.
C1 verb /ˈskruː.tɪ.naɪz/

scrutinize

Meaning
Examine or inspect closely and thoroughly.
Example
The scientist scrutinized the data before publishing his findings.
C1 verb/noun /ˈsɒldər/

solder

Meaning
To join metal parts together by melting and putting a filler metal into the joint
Example
He soldered the broken wires back together.
C1 verb /ˈskʌr.i/

scurry

Meaning
To move quickly with short, hurried steps.
Example
The mice scurried across the kitchen floor when the lights turned on.
C1 verb /ˈskævɪndʒ/

scavenge

Meaning
to search through waste or discarded material to find useful items
Example
The children scavenged for food in the garbage dump.
C1 verb/noun /skɒtʃ/

scotch

Meaning
to put an end to something; also a type of whisky
Example
The report scotched the rumors of a merger.
C1 verb /skɪmp/

skimp

Meaning
to use less of something than is necessary in order to save money or effort
Example
Don’t skimp on quality when buying a new laptop.
C1 noun /ˈstaɪləs/

stylus

Meaning
a small tool used for writing, drawing, or touching screens
Example
She used a stylus to draw on her tablet.
C1 noun /ˈsaɪnəs/

sinus

Meaning
A cavity within a bone or tissue, especially those in the bones of the face connected with the nasal cavities.
Example
He suffered from a sinus infection that caused headaches.
C1 noun /ˈʃrɪŋkɪdʒ/

shrinkage

Meaning
The process of becoming smaller in size, amount, or value.
Example
The company reported a shrinkage in profits this quarter.
C1 noun /ˈʃʊɡ.ər ˈkæn.di/

Sugar candy

Meaning
crystallized sugar formed into small pieces; rock candy made from sugar syrup
Example
The children enjoyed eating colorful sugar candy at the festival.
C1 noun /slɪt/

Slit

Meaning
a long narrow opening or cut
Example
There was a small slit in the fabric.
C1 noun /sloʊθ/

Sloth

Meaning
laziness; reluctance to work or make an effort
Example
His sloth prevented him from achieving his goals.
C1 noun ˌsɪs.təˈmæt.ɪk ˈstræt.ə.dʒi

systematic strategy

Meaning
A methodical and organized plan or approach to achieve specific objectives.
Example
A systematic strategy was employed to achieve objectives.
C1 noun səˈsteɪnəbəl ˈpræktɪsɪz

sustainable practices

Meaning
Methods and activities that can be maintained over time without depleting natural resources or harming the environment.
Example
Sustainable practices are vital for environmental preservation.
C1 adjective /ˈspɪndli/

spindly

Meaning
Long, thin, and weak-looking
Example
The spindly tree bent under the weight of the snow.
C1 adjective /səbˈdʒɛktɪv/

subjective

Meaning
based on personal feelings, tastes, or opinions rather than facts
Example
Beauty is often considered a subjective concept.
C1 noun /stɪˈlɛtoʊ/

stiletto

Meaning
A small, thin, high-heeled shoe or a dagger with a slender blade.
Example
She wore elegant stiletto heels to the party.
C1 adjective /ˈsted.fæst/

Steadfast

Meaning
firm in belief, determination, or adherence; unwavering
Example
She remained steadfast in her commitment to helping the poor.
C1 noun/adjective /ˈstɜː.lɪŋ/

sterling

Meaning
British money, especially pounds; of excellent quality.
Example
She was praised for her sterling work on the project.
C1 verb ˈsɪn.ɚ.dʒaɪz

synergize

Meaning
combine in such a way as to enhance effectiveness.
Example
The departments must synergize to improve efficiency.
C1 noun /ˈsɜːrtʃɑːrdʒ/

surcharge

Meaning
an additional charge or payment added to the usual cost
Example
The airline ticket had a fuel surcharge added to it.
C1 adverb /ˈsɜːrtʃɪŋli/

searchingly

Meaning
In a way that seems to look for hidden meanings or truth.
Example
She looked at him searchingly, hoping for an honest answer.
C1 verb /ˈsætəˌraɪz/

satirize

Meaning
to mock or criticize something using satire
Example
The play satirizes the greed of modern corporations.
C1 noun /ˈsɪməli/

simile

Meaning
A figure of speech involving the comparison of one thing with another using 'like' or 'as'.
Example
She used a simile to describe her eyes as bright as stars.
C1 verb /ˈsɪmjʊˌleɪt/

simulate

Meaning
to imitate the appearance, character, or behavior of something; to pretend or reproduce conditions artificially
Example
The pilot had to simulate an emergency landing during training.
C1 noun /siˈɛrə klʌb/

Sierra Club

Meaning
An American environmental organization founded in 1892 by John Muir, focused on promoting conservation of the natural environment by influencing public policy decisions.
Example
John Muir founded the Sierra Club in 1892 to protect wild areas.
C1 noun /ˈsʌm.ɪt əv ðə ˈfjuː.tʃər/

Summit of the Future

Meaning
A high-level conference focused on addressing future challenges and opportunities.
Example
The Summit of the Future addressed global challenges.
C1 noun, verb /səˈpiːnə/

subpoena

Meaning
a legal document ordering someone to attend court; to summon someone with such a document
Example
The witness received a subpoena to appear in court next week.
C1 noun /ˈseɪ.tən/

Satan

Meaning
the chief evil spirit; the Devil in Christian and Islamic belief
Example
According to religious texts, Satan tempts people to sin.
C1 adjective /ˈstrɛnjuəs/

strenuous

Meaning
Requiring or using great effort and energy.
Example
Climbing the mountain was a strenuous task.
C1 verb /ˈstriːm.laɪn/

streamline

Meaning
To make a process simpler and more efficient.
Example
The company aims to streamline production to reduce costs.
C1 adjective /suːˈpɜːr.flu.əs/

superfluous

Meaning
Unnecessary, especially through being more than enough.
Example
His speech contained too many superfluous details.
C1 adjective /ˈstæɡ.nənt/

Stagnant

Meaning
not moving or flowing; showing no activity or development
Example
The stagnant water in the pond was covered with algae.
C1 adjective /ˌsʌbˈkɒn.ʃəs/

subconscious

Meaning
Of or concerning the part of the mind which one is not fully aware of but which influences actions and feelings.
Example
Fears often come from the subconscious mind.
C1 verb /ˈsmʌðər/

smother

Meaning
to kill someone by covering their nose and mouth to prevent breathing; to cover something completely; to overwhelm with excessive attention or affection
Example
She smothered the fire with a blanket.
C1 verb /ˈstrætɪfaɪ/

stratify

Meaning
to arrange or divide into layers, classes, or categories
Example
The researchers plan to stratify the data based on age groups.
C1 verb /siːð/

seethe

Meaning
To be filled with intense but unexpressed anger or agitation.
Example
She was seething with anger after the unfair decision.
C1 noun /ˈstɪm.jʊ.laɪ/

stimuli

Meaning
Things that create reactions or provide motivation.
Example
Bright light and loud sounds are common stimuli for alertness.
C1 noun /sɪlk klɔːθ/

Silk cloth

Meaning
fabric made from natural fibers produced by silkworms
Example
The bride wore a beautiful dress made of silk cloth.
C1 noun /ˈsæŋk.ʃən/

Sanction

Meaning
official permission or approval; a penalty for disobeying a rule
Example
The government imposed economic sanctions on the country.
C1 noun /ˈsɜːr.vɪ.tuːd/

Servitude

Meaning
the state of being a slave or completely subject to someone more powerful
Example
Many people fought to escape the servitude imposed by the colonial system.
C1 noun /ʃɑːrd/

shard

Meaning
a broken piece of glass, metal, or pottery
Example
He cut his finger on a shard of glass.
C1 adjective /ˈskrʌfi/

Scruffy

Meaning
untidy or unkempt in appearance; shabby and worn
Example
The scruffy old dog wandered through the streets looking for food.
C1 noun /ˈspaɪər/

spire

Meaning
a tall, pointed structure on top of a building, especially a church
Example
The church spire could be seen from miles away.
C1 noun /ˈskep.tɪ.sɪ.zəm/

skepticism

Meaning
A skeptical attitude; doubt as to the truth of something.
Example
His skepticism about new technology often makes him resistant to change.
C1 noun /ˈstætʃuːt/

statute

Meaning
A written law passed by a legislative body.
Example
The new statute protects workers' rights.
C1 noun /ˈsæf.rən/

Saffron

Meaning
a deep yellow-orange color; an expensive spice derived from crocus flowers
Example
The saffron fabric looked beautiful in the sunlight.
C1 noun /ˈskwɒlər/

squalor

Meaning
the state of being extremely dirty and unpleasant, especially due to poverty or neglect
Example
They lived in squalor without basic facilities.
C1 noun /ˌsɛlf əˌfɜːˈmeɪʃən/

self-affirmation

Meaning
The practice of affirming one's own worthiness and value as an individual.
Example
Daily self-affirmation can boost your confidence.
C1 noun /ˌsɛrənˈdɪpɪti/

serendipity

Meaning
The occurrence of events by chance in a happy or beneficial way.
Example
Finding that old photo album was pure serendipity.
C1 noun ˌsæn.ɪ.taɪˈzeɪ.ʃən

sanitization

Meaning
The process of cleaning and disinfecting to eliminate germs and bacteria.
Example
Regular sanitization keeps appliances germ-free.
C1 adjective /ˈsæk.rəˌsæŋkt/

sacrosanct

Meaning
Regarded as too important or valuable to be interfered with; sacred.
Example
Freedom of speech is considered sacrosanct in democratic societies.
C1 noun /ʃraɪn/

Shrine

Meaning
a holy or sacred place dedicated to a specific deity, ancestor, hero, or saint
Example
Pilgrims visit the shrine to pray for good health.
C1 noun ˈsʌb.tɛkst

subtext

Meaning
Hidden meaning or message behind spoken or written words
Example
The subtext of his speech suggested disagreement.
C1 adjective /ˈskræpi/

scrappy

Meaning
Determined and willing to fight or argue; also messy or disorganized.
Example
Despite being small, he was a scrappy fighter.
C1 noun /ˈstəʊ.ɪ.sɪ.zəm/

stoicism

Meaning
The endurance of pain or hardship without the display of feelings and without complaint.
Example
His stoicism during hardship was admirable.
C1 adjective /ˈseɪlaɪn/

Saline

Meaning
containing salt; salty; relating to salt water
Example
The saline solution is used for medical treatments.
C1 verb /ʃraʊd/

shroud

Meaning
to cover or hide; to wrap in cloth
Example
The mountain peak was shrouded in mist.
C1 adjective /ˈspjʊəriəs/

spurious

Meaning
Not genuine, authentic, or true; false or fake.
Example
The report was based on spurious claims.
C1 adjective /ˈsæŋɡwɪn/

sanguine

Meaning
Optimistic or positive, especially in a difficult situation.
Example
Despite the challenges, she remained sanguine about the future.
C1 noun /ˈsɑːɡə/

saga

Meaning
A long story of heroic achievement, or a long, complex series of events.
Example
The company's rise and fall became a corporate saga.
C1 verb /skwiːl/

squeal

Meaning
to make a high-pitched cry; to inform on someone
Example
The children squealed with delight when they saw the surprise.
C1 verb /səˈplænt/

supplant

Meaning
To take the place of something or someone, often by force or strategy.
Example
Digital platforms have supplanted traditional newspapers.
C1 adjective /ˈsʌbstəntɪv/

substantive

Meaning
Having a firm basis in reality; important, meaningful, or considerable.
Example
The company made substantive changes to its policy.
C1 adjective /səbˈmɪs.ɪv/

Submissive

Meaning
ready to obey others; yielding to authority; humble and compliant
Example
She became submissive after years of harsh treatment.
C1 verb /spɔːn/

spawn

Meaning
to produce or generate, often in large numbers
Example
The video game has spawned many sequels.
C1 verb /ˈʃʌdər/

shudder

Meaning
to tremble or shake suddenly, often due to fear, cold, or strong emotion
Example
She shuddered at the thought of walking alone in the dark forest.
C1 noun /sɪˈkluːʒən/

seclusion

Meaning
The state of being private, away from other people.
Example
She spent the weekend in complete seclusion in her cabin.
C1 noun /sɪr/

seer

Meaning
A person who is supposed to be able to see what will happen in the future; a prophet.
Example
The seer predicted a great change in the kingdom.
C1 noun /streɪt/

strait

Meaning
A narrow passage of water connecting two seas or two large areas of water.
Example
The Strait of Gibraltar connects the Atlantic Ocean and the Mediterranean Sea.
C1 adjective /ˈskwiːmɪʃ/

squeamish

Meaning
easily made to feel sick, faint, or disgusted
Example
She felt squeamish at the sight of blood.
C1 adjective /sɔɪld/

soiled

Meaning
dirty or stained; not clean
Example
His clothes were soiled after playing in the mud.
C1 verb /stoʊk/

stoke

Meaning
To add fuel to a fire; to encourage or increase a strong feeling or activity.
Example
The politician’s speech stoked anger among the crowd.
C1 noun /ˌsəʊʃəˈbɪləti/

sociability

Meaning
The quality or state of being sociable; friendliness.
Example
Her sociability made her popular in the office.
C1 adjective /ˈsliːzi/

sleazy

Meaning
morally low, dirty, or cheap in quality
Example
He avoided the sleazy nightclub downtown.
C1 adjective /ˈsʌpl/

supple

Meaning
Easily bending or moving without breaking; flexible and adaptable.
Example
The gymnast’s body was remarkably supple.
C1 adjective /səˈtɪrɪk/

satiric

Meaning
Relating to or using satire.
Example
The novel takes a satiric view of urban life.
C1 verb /səˈlɪsɪt/

solicit

Meaning
to ask for or try to obtain something from someone
Example
The charity is soliciting donations for flood victims.
C1 noun /ˈswɪndlɚ/

swindler

Meaning
a person who cheats or deceives others for money or gain
Example
The police finally caught the notorious swindler.
C1 noun /ˌsɛnsɪtaɪˈzeɪʃən/

sensitization

Meaning
The process of becoming sensitive to a substance, situation, or influence.
Example
The doctor warned about the sensitization caused by repeated exposure to chemicals.
C1 verb/noun /stuːp/

stoop

Meaning
To bend one's body forward and downward; also a small porch or staircase at the entrance of a house
Example
He had to stoop to pick up the coin.
C1 adjective /stjuːˈpɛndəs/

stupendous

Meaning
extremely impressive; amazing in size, degree, or excellence
Example
The magician’s performance was simply stupendous.
C1 noun/verb /ˈsuː.tʃər/

suture

Meaning
A stitch or row of stitches holding together the edges of a wound or surgical incision.
Example
The doctor used a suture to close the wound.
C1 adjective ˌsəʊsɪəʊpəˈlɪtɪkəl

sociopolitical

Meaning
Combining social and political factors.
Example
Sociopolitical factors often influence public policy decisions.
C1 verb /sɪˈdjuːs/

seduce

Meaning
to attract someone into doing something, especially something they might not normally do
Example
The advertisement was designed to seduce customers into buying luxury products.
C1 noun /swiːt.laɪm/

Sweetlime

Meaning
a citrus fruit that is sweeter and less acidic than regular lime
Example
The sweetlime juice was refreshing on a hot day.
C1 verb, noun /sæp/

sap

Meaning
As a noun: the vital fluid in plants; As a verb: to gradually weaken or drain strength.
Example
The long journey began to sap his energy.
C1 adjective /ˈspel.baʊnd/

Spellbound

Meaning
completely fascinated and unable to move or think about anything else; enchanted
Example
The children sat spellbound as the magician performed his tricks.
C1 noun /sɔɪl ˈmæn.ɪdʒ.mənt/

soil management

Meaning
The application of operations, practices, and treatments to protect soil and enhance its performance.
Example
Proper soil management improves long-term agricultural productivity.
C1 verb /skʌlpt/

sculpt

Meaning
to create or shape something by carving or molding
Example
The artist sculpted a beautiful statue from marble.
C1 noun /sɔːd fɪʃ/

Sword fish

Meaning
A large marine fish with an elongated bill resembling a sword
Example
The swordfish can swim at speeds up to 60 mph.
C1 noun /səˈbraɪəti/

sobriety

Meaning
the state of being sober; self-restraint and seriousness
Example
He has maintained his sobriety for five years.
C1 adjective /swɑːv/

suave

Meaning
charming, confident, and elegant, often in a smooth or polished way
Example
He was a suave gentleman who impressed everyone at the party.
C1 noun /ˈsɪmətri/

symmetry

Meaning
the quality of having balanced proportions or identical parts facing each other
Example
The building’s symmetry impressed the visitors.