secant
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C2 noun /ˈsiːkənt/

secant

Meaning
A straight line that intersects a curve at two or more points.
Example
In geometry, a secant cuts the circle at two distinct points.
B2 noun sliːp ˌdɛprɪˈveɪʃən

sleep deprivation

Meaning
The condition of not having enough sleep; lack of adequate sleep.
Example
Sleep deprivation can severely impact mental health.
B1 adjective ˌsaɪənˈtɪfɪk

scientific

Meaning
Based on or characterized by the methods and principles of science.
Example
Scientific discoveries continue to shape our understanding of the world.
B1 adjective /ˈskɪlfʊl/

Skilful

Meaning
having or showing skill; expert and accomplished
Example
The skilful surgeon performed the operation with great precision.
C2 noun /ˌʃæŋɡriˈlɑː/

shangri-la

Meaning
a remote, beautiful, imaginary place where life is perfect and peaceful
Example
They described the island as a modern-day Shangri-La.
B1 noun /ˈsʌn.flaʊər/

Sun flower

Meaning
a large yellow flower that turns to face the sun
Example
The sunflower field looked amazing in the bright sunlight.
B2 noun /səbˈskraɪbər/

subscriber

Meaning
a person who receives or subscribes to a service, magazine, or service
Example
She is a subscriber to the monthly magazine.
A1 verb /stɒp/

stop

Meaning
to cease moving or operating; to halt; to prevent
Example
Please stop talking during the movie.
B1 noun /ˈsæl.ər.i/

Salary

Meaning
a fixed regular payment, typically paid on a monthly basis
Example
She receives a good salary for her work as a teacher.
B1 noun ˈstæn.dədz

standards

Meaning
A level of quality or attainment; a required or agreed level of quality or attainment.
Example
High standards inspire competitors.
B1 noun /striːm/

stream

Meaning
A small, narrow river; a continuous flow of something.
Example
The stream of life is unstoppable.
B2 adjective /ˈsɒl.ɪ.ter.i/

Solitary

Meaning
alone; without companions; single; isolated
Example
He lived a solitary life in the mountains.
C2 adjective /suːˈpɜːrnəl/

supernal

Meaning
Relating to the heavens; celestial or divine.
Example
The painting captured a supernal beauty that felt otherworldly.
C2 noun /ˌsɪləbɪˈkeɪʃən/

syllabication

Meaning
The division of words into syllables.
Example
Proper syllabication helps in correct pronunciation.
C1 noun /ˈsɔː.dʌst/

sawdust

Meaning
The tiny particles of wood produced by sawing or sanding.
Example
The floor was covered with sawdust from the carpentry work.
C1 verb /ˈsɪn.θə.saɪz/

synthesize

Meaning
To combine a number of things into a coherent whole.
Example
Scientists synthesize new compounds for medical research.
C1 verb /splaɪs/

splice

Meaning
to join two pieces of rope, film, or other material by weaving or attaching them together
Example
The technician spliced the two wires to restore the connection.
C1 verb sɪˈkwɛstər

sequester

Meaning
To isolate or hide away.
Example
The carbon captured by trees can be sequestered for years.
B2 noun /ˈsəʊ.ʃəl.ɪ.zəm/

socialism

Meaning
An economic system where the means of production are owned by the state or community.
Example
In socialism, resources are distributed equally among citizens.
B2 noun /ˈsnoʊ.fɔːl/

Snowfall

Meaning
the process of snow falling from the sky; the amount of snow that falls
Example
The heavy snowfall blocked all the roads yesterday.
C1 adjective /ˈsʌbstəntɪv/

substantive

Meaning
Having a firm basis in reality; important, meaningful, or considerable.
Example
The company made substantive changes to its policy.
B2 noun /ˈseɪf.ɡɑːrd/

Safeguard

Meaning
measure or action designed to protect someone or something
Example
New safeguards were implemented to prevent data breaches.
A1 pronoun /ˈsʌmbədi/

somebody

Meaning
an unspecified person
Example
Somebody is knocking at the door.
C2 noun /skɪf/

skiff

Meaning
a small, light boat usually for one person
Example
The fisherman paddled his skiff across the lake.
B2 noun /ˈsmɑːrt.nəs/

Smartness

Meaning
intelligence; cleverness; neat and fashionable appearance
Example
Her smartness in solving problems impressed everyone.
C1 verb /ˈstaɪfl/

stifle

Meaning
to prevent or restrain an action, idea, or emotion; to suffocate
Example
She tried to stifle a laugh during the serious meeting.
C1 noun /ˈsaɪ.ən/

scion

Meaning
a descendant of a wealthy, aristocratic, or influential family
Example
He is the scion of a wealthy industrialist family.
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.
C2 noun /sɛnˈsɔːrɪəm/

sensorium

Meaning
The part of the brain or mind concerned with the reception and interpretation of sensory stimuli.
Example
The patient’s sensorium was clouded after the accident.
C1 adjective /ˈseɪ.li.ənt/

salient

Meaning
Most important, prominent, or noticeable
Example
The report highlighted the salient points of the discussion.
C2 verb /ˈseɪʃiˌeɪt/

satiate

Meaning
To satisfy fully, especially with food or desire.
Example
The large meal satiated his hunger.
B2 verb /ˈsɪmbəlaɪz/

symbolize

Meaning
to represent or stand for something else
Example
The dove symbolizes peace across cultures.
B1 noun /ˈsʌb.weɪ/

Subway

Meaning
an underground railway system; an underground passage for pedestrians
Example
I take the subway to work every morning because it's faster than driving.
B2 verb /skwiːz/

squeeze

Meaning
to press something firmly, especially from all sides in order to extract or compress it
Example
She squeezed the toothpaste to get the last bit.
B2 noun /sərˈvaɪvər/

Survivor

Meaning
a person who survives, especially a person remaining alive after an event in which others have died
Example
She is a cancer survivor who now helps other patients.
A2 verb /skiː/

ski

Meaning
to glide over snow on skis
Example
We went skiing in the Alps last winter.
B2 noun /suː.pɪər.iˈɔːr.ə.ti/

Superiority

Meaning
the quality or state of being superior; higher rank or quality
Example
His superiority in mathematics was evident from his test scores.
C2 noun /slaɪt/

sleight

Meaning
Skill or dexterity, especially in performing tricks.
Example
The magician amazed the crowd with his sleight of hand.
B1 adjective /ˌstreɪt ˈfɔːr.wərd/

Straight forward

Meaning
honest and open; not complicated; easy to understand
Example
His explanation was very straightforward and easy to follow.
A1 adverb /suːn/

Soon

Meaning
in a short time; before long; quickly
Example
The train will arrive soon.
C2 adjective /ˈsɛrid/

serried

Meaning
pressed or crowded together, often in rows or ranks
Example
The soldiers stood in serried ranks, ready for inspection.
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.
B2 noun /stɔːrk/

Stork

Meaning
large wading bird with long legs and a long neck
Example
The stork built its nest on top of the tall chimney.
B2 noun /ˌsɪmjuˈleɪʃən/

simulation

Meaning
the imitation of a situation or process
Example
The simulation helped the students understand the complex theory.
C1 noun /ˈskɛptɪk/

skeptic

Meaning
A person who doubts or questions accepted beliefs or claims.
Example
The scientist was a skeptic of theories without solid evidence.
B2 adjective /ˈstraɪkɪŋ/

striking

Meaning
very noticeable or impressive in appearance or effect
Example
Her striking beauty caught everyone's attention.
B2 noun /səbˈskrɪp.ʃən/

Subscription

Meaning
a payment for regular delivery of a service or product; an arrangement to receive something regularly
Example
I canceled my Netflix subscription because I wasn't watching it enough.
C1 noun /ˈsɛpərətɪst/

separatist

Meaning
A person who supports the separation of a group from a larger body, often for political or cultural independence.
Example
The separatist group demanded independence from the central government.
B2 adjective, noun /ˈsɪŋɡjələr/

singular

Meaning
Remarkable, extraordinary; or grammatical form referring to one person or thing.
Example
She has a singular talent for painting.
A2 noun /ˈsiː.nər.i/

Scenery

Meaning
the natural features of a landscape; the painted background used on a theater stage
Example
The mountain scenery was breathtakingly beautiful.
C1 noun /ˈsteɪtəs kwoʊ/

status quo

Meaning
The existing state of affairs, especially regarding social or political issues.
Example
The government decided to maintain the status quo until further review.
B1 noun səˈluː.ʃənz

solutions

Meaning
A means of solving a problem or dealing with a difficult situation.
Example
Biotechnology provides solutions to environmental challenges.
B1 verb /stretʃ/

stretch

Meaning
to extend or expand; to make or become longer or wider
Example
Athletes stretch their muscles before exercising.
A1 noun /ˈsekənd/

second

Meaning
a unit of time equal to one sixtieth of a minute; also the position after first
Example
He finished the race in second place.
B2 adjective /səˈbɜːrbən/

suburban

Meaning
relating to or characteristic of a suburb or the people living there
Example
They bought a house in a quiet suburban area.
B2 verb /swiːp/

sweep

Meaning
to clean by brushing; to move quickly and smoothly
Example
She sweeps the floor every morning.
B1 verb /spaɪ/

spy

Meaning
to secretly collect information about a person, group, or country
Example
He was caught spying on his neighbor through the window.
B2 adjective /ˈstɛdi/

steady

Meaning
firm, stable, and not likely to change suddenly
Example
He kept his hand steady while painting the picture.
C1 noun /ʃæk/

Shack

Meaning
a small, crudely built dwelling; a poorly constructed building
Example
The fisherman lived in a small shack near the beach.
C1 verb /sərˈmaɪz/

surmise

Meaning
to suppose something is true without having evidence
Example
She surmised that he was not coming to the meeting.
C2 noun /səˈlɪsɪˌtuːd/

solicitude

Meaning
Care or concern for someone or something.
Example
His mother showed great solicitude for his safety.
A1 verb /seɪ/

say

Meaning
to speak words; to express something in words
Example
She said hello to me.
C2 adjective /ˈsmɑːrmi/

smarmy

Meaning
Excessively flattering or ingratiating, often insincerely.
Example
The salesman gave a smarmy pitch that felt fake.
C1 adjective /ˌsɛlf əbˈzɔːrbd/

self-absorbed

Meaning
Excessively preoccupied with oneself and one’s own thoughts, feelings, or interests.
Example
He was too self-absorbed to notice his friend's distress.
C1 verb ˈsɪŋ.krə.naɪz

synchronize

Meaning
To coordinate in time; to cause to occur or operate at the same time or rate.
Example
The dancers need to synchronize their movements.
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 adjective /ˈʃɪp.ʃeɪp/

Shipshape

Meaning
neat and tidy; in good order; well-organized
Example
Everything was shipshape before the inspection.
B2 noun /ˌspɛsɪfɪˈkeɪʃən/

specification

Meaning
a detailed description or assessment of something
Example
The product specification includes all the necessary details.
B2 adjective /slɪk/

slick

Meaning
Smooth, clever, or efficient, often in a way that seems superficial.
Example
He gave a slick presentation to impress the investors.
C1 adjective /ˈsɔːsi/

saucy

Meaning
Boldly rude, cheeky, or playfully disrespectful.
Example
The child gave a saucy reply to his teacher.
B2 noun /ˈskɒlərʃɪp/

scholarship

Meaning
an award or grant to support a student's education
Example
She received a scholarship to study abroad.
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.
B1 noun /ˈsʌb.stəns/

Substance

Meaning
a particular kind of matter with uniform properties; the essential nature of something; material or content
Example
The scientist analyzed the unknown substance in the laboratory.
A1 adverb /ˈsʌm.taɪmz/

Sometimes

Meaning
at times; occasionally; now and then
Example
Sometimes I go for a walk in the evening.
B1 noun /ˈseɪ.lər/

Sailor

Meaning
a person who works on a ship or boat; a member of a navy
Example
The experienced sailor navigated the ship through the storm.
A1 modal verb /ʃʊd/

should

Meaning
used to indicate obligation or duty
Example
You should study for your exams.
C2 verb /ˈsæŋktɪfaɪ/

sanctify

Meaning
to make holy or sacred; to purify
Example
The priest will sanctify the marriage ceremony.
B2 adjective /ˈsɛkʃʊəl/

sexual

Meaning
relating to the instincts, physiological processes, and activities connected with physical attraction or intimate physical contact between individuals
Example
The sexual health of individuals is an important topic in modern medicine.
C2 adjective /ˈsɒmnələnt/

somnolent

Meaning
Sleepy or drowsy; causing a desire to sleep.
Example
The somnolent lecture made half the class fall asleep.
C2 noun ˌsʌb.dʒʊˈɡeɪ.ʃən

subjugation

Meaning
The action of bringing someone or something under domination or control, especially by force.
Example
The subjugation of weaker nations by colonial powers shaped history.
B2 adjective /ˈsoʊlər/

solar

Meaning
Relating to or determined by the sun
Example
The house is powered by solar energy.
B2 verb, noun /sniːz/

sneeze

Meaning
to expel air involuntarily from the nose and mouth due to irritation; the act of sneezing
Example
I had to sneeze during the meeting.
C2 verb /ˈsɪn.tɪ.leɪt/

scintillate

Meaning
to sparkle or shine brightly; to emit flashes of light
Example
The diamond ring scintillated under the bright lights.
B2 noun /ˈspəʊkspɜːrsən/

spokesperson

Meaning
a person who speaks on behalf of others or an organization
Example
The spokesperson addressed the press conference on behalf of the company.
A1 adjective /seɪm/

same

Meaning
identical; not different or changed
Example
We wore the same dress at the party.
C1 adjective ˌsɪn.əˈdʒɪs.tɪk

synergistic

Meaning
Relating to the interaction of elements that when combined produce a greater effect than the sum of their individual effects.
Example
A synergistic effect occurs when nutrients work together.
C1 adjective /ˈstrɪndʒənt/

stringent

Meaning
strict, precise, and exacting
Example
The government imposed stringent measures during the crisis.
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 /skɒf/

scoff

Meaning
to speak about something in a mocking or dismissive way
Example
He scoffed at the idea of moving abroad.
C2 noun /ˌsɒ̃ˈfrwɑː/

sangfroid

Meaning
Composure or coolness under pressure.
Example
She impressed everyone with her sangfroid during the interview.
B2 noun /ˈsteɪdiəm/

stadium

Meaning
a large structure with seating for sports, concerts, or other events
Example
Thousands of fans filled the stadium to watch the final match.
A1 adjective /ˈsɪmpəl/

Simple

Meaning
easy to understand or do; not complicated
Example
This is a simple recipe that anyone can follow.
A2 adjective /ˈsep.ər.ət/

Separate

Meaning
distinct; not connected; individual; apart
Example
Please keep your personal and professional lives separate.
C1 noun /ˈsɔːjər/

Sawyer

Meaning
a person who saws wood, especially as an occupation
Example
The skilled sawyer cut the logs into planks.
B1 noun ˈsaɪləns

silence

Meaning
Complete absence of sound; quietness.
Example
Silence filled the air near the graves.
C1 verb /skʌf/

scuff

Meaning
to mark or scratch the surface of something by rubbing
Example
He scuffed his shoes on the pavement.
A1 verb /steɪ/

stay

Meaning
to remain in the same place; to continue being
Example
Please stay here until I return.
A1 noun /ʃɜːrt/

Shirt

Meaning
a piece of clothing worn on the upper body with sleeves and buttons
Example
He wore a white shirt to the office.
B1 verb /sɪˈlekt/

select

Meaning
to choose from a number of alternatives; to pick out
Example
Please select your favorite color.
C2 noun /ˈsɒfɪst/

sophist

Meaning
a person who uses clever but misleading arguments
Example
He was dismissed as a sophist who twisted facts to win debates.
B2 verb /swer/

swear

Meaning
to use offensive language; to promise solemnly; to take an oath
Example
I swear to tell the truth.
C1 verb /səˈlɪdəˌfaɪ/

solidify

Meaning
To make something firm, strong, or more certain.
Example
The company solidified its position in the market.
B1 verb /ˈsætɪsfaɪ/

satisfy

Meaning
to fulfill the desires, expectations, or needs of someone; to make content
Example
The delicious meal satisfied our hunger completely.
C1 verb /ˈskaʊər/

scour

Meaning
to clean or brighten the surface of something by scrubbing; to search thoroughly
Example
She scoured the kitchen until it shone.
C2 noun /ˈsweɪʒən/

suasion

Meaning
the act of persuading or influencing someone
Example
The leader used gentle suasion to win support for the plan.
C2 verb /ˈsʌli/

sully

Meaning
to damage the purity, integrity, or reputation of something
Example
The scandal sullied the politician’s reputation.
C1 verb /ˌsuːpərɪmˈpoʊz/

superimpose

Meaning
to place one thing on top of another so that both can be seen
Example
The editor superimposed text over the image.
A1 adjective /ʃɔːrt/

Short

Meaning
having a small length, height, or duration; not long
Example
The meeting was very short, lasting only ten minutes.
B2 verb /sæk/

sack

Meaning
to dismiss from a job; to put something in a sack
Example
The company sacked him for poor performance.
A2 adjective /ˈsəʊʃəl/

social

Meaning
relating to society or its organization
Example
She has a very social personality and enjoys meeting new people.
B2 verb ˈstɪmjəleɪt

stimulate

Meaning
To encourage or promote the development or growth of something
Example
Proper sunlight stimulates plant growth.
C1 noun ˈsʌs.tɪ.nəns

Sustenance

Meaning
Food or support necessary for sustaining life
Example
Water is essential for human sustenance.
C1 verb /smɪr/

smear

Meaning
to spread or apply a substance messily; to damage someone's reputation with false or unfair words
Example
The child smeared paint across the wall.
B1 verb, adjective /spɛnt/

spent

Meaning
Past tense and past participle of 'spend'; also used as an adjective meaning exhausted or used up.
Example
She spent all her energy preparing for the exam.
A2 noun /ˈsteɪʃən/

station

Meaning
a place where a particular service is provided, especially for transportation
Example
We arrived at the station just in time for the train.
B2 noun /ˈsɪləbəs/

syllabus

Meaning
An outline or summary of topics to be covered in a course of study.
Example
The professor handed out the syllabus on the first day of class.
C2 adjective /sɪər/

sere

Meaning
Dry or withered, especially vegetation.
Example
The sere leaves crumbled under his feet.
C1 verb /siːp/

seep

Meaning
to flow or leak slowly through small openings or pores
Example
Water began to seep through the cracks in the wall.
A1 noun /ˈsɪstər/

sister

Meaning
a female sibling; a girl or woman in relation to other children of her parents
Example
My sister is coming to visit us next week.
C2 adjective /ˈsæpɪd/

sapid

Meaning
Having a pleasant taste; flavorful.
Example
The chef prepared a sapid dish that delighted everyone at the table.
C2 adjective /ˌsʌb.əˈkwɒt.ɪk/

subaquatic

Meaning
Existing, living, or located under water.
Example
Divers explored the subaquatic cave system filled with rare fish.