CEFR Level
a large tree that produces acorns and has strong, hard wood
"The old oak tree provided shade for the entire yard."
A type of porridge made from ground oats, often eaten for breakfast.
"She eats a bowl of oatmeal every morning for breakfast."
compliance with an order, request, or law; submission to authority
"Children should show obedience to their parents."
The condition of being very overweight, especially to a degree that it is harmful to health.
"Obesity is a growing health problem in many countries."
an expression or feeling of disapproval or opposition
"The lawyer raised an objection during the trial."
a duty or commitment
"You have an obligation to follow the rules."
to do something as a favor or kindness for someone
"She obliged by helping him with the task."
Not clearly expressed or understood; to make something difficult to see or understand.
"The meaning of the poem was obscure to most readers."
the action or process of observing something carefully in order to gain information
"The scientist made an observation during the experiment."
The action or process of observing something carefully.
"Observations of distant galaxies provide new insights."
To celebrate or keep a religious or other festival.
"The day is observed annually to raise awareness."
a person who watches or notices something
"The observer took notes during the meeting."
An idea, thought, or concern that continually preoccupies or intrudes on a person's mind.
"His obsession with success drove him to work day and night."
to get, acquire, or secure something
"She managed to obtain a scholarship for her studies."
A person who resides in or is present in a house, vehicle, seat, or place.
"The car had three occupants at the time of the accident."
being in use or taken; filled or lived in; controlled or held by force
"The room is occupied, so please wait outside."
to take control or possession of a place or thing
"The workers will occupy the building until the renovations are completed."
in a strange or unusual way; unexpectedly
"Oddly, he didn’t seem upset by the bad news."
the likelihood or probability of something happening; chances for or against something
"The odds of winning the lottery are very low."
a distinctive smell, especially an unpleasant one
"The odour of fresh bread filled the kitchen."
a breach of law or rule; an annoyance or resentment
"Stealing is a serious offence punishable by law."
to cause someone to feel upset, insulted, or annoyed
"She didn’t mean to offend anyone with her remarks."
an illegal act; a crime
"The offense was committed in broad daylight."
Causing hurt, anger, or annoyance; also relating to attacking in sports or war.
"His offensive remarks upset everyone at the meeting."
something that is given, especially as a gift or contribution
"The company’s latest offering is an eco-friendly car."
in a formal or authorized way
"The building was officially opened by the mayor."
covered with oil; containing oil; greasy
"Her oily skin needs special care."
to leave out or exclude; to fail to include something
"Please don't omit any important details from your report."
one part of something that is divided into three equal parts
"One-third of the class was absent today."
continuing; still in progress
"The ongoing project will finish next month."
in a way that is not secret or hidden
"He spoke openly about his past mistakes."
related to or engaged in the operation of something
"The team is ready for the operational phase of the project."
a person who operates equipment, a business, or controls something
"The machine operator ensured that everything ran smoothly."
A person who competes against or disagrees with another.
"The boxer defeated his opponent in the final round."
to disagree with or fight against something
"He opposed the new policy at the meeting."
being against or in disagreement with something
"She is strongly opposed to animal testing."
the action of opposing or resisting something
"The opposition to the new law was strong."
to choose or decide to do something instead of something else
"Many students opt to study abroad for better opportunities."
A person who makes or sells glasses and contact lenses.
"The optician adjusted my new glasses to fit better."
Best or most favorable; ideal.
"This diet plan provides the optimal balance of nutrients."
The best or most favorable temperature for a particular purpose
"Winter provides optimal temperature for farming."
Hopefulness and confidence about the future.
"Her optimism kept the team motivated during tough times."
A person who tends to be hopeful and confident about the future or the success of something.
"Even in tough times, she remained an optimist."
hopeful and confident about the future
"She is optimistic about the success of her new project."
Not required; left to personal choice.
"The dress code for the party is optional."
Spoken rather than written; relating to the mouth
"The student had to give an oral presentation."
a large arboreal ape with long reddish hair, long arms, and hooked hands and feet, native to Borneo and Sumatra
"The orangutan swings gracefully through the forest canopy."
the curved path that a planet, satellite, or object follows around another body in space
"The Earth moves in an orbit around the Sun."
a large group of musicians playing different instruments together
"The orchestra performed beautifully at the concert."
well-organized; systematic; peaceful
"Please keep your desk orderly and clean."
