Word library
8,130 words, searchable by word, definition, part of speech, and CEFR level.
The branch of medicine that studies how diseases spread and affect populations.
A short section added to the end of a book or play that reveals what happens after the main story ends.
A sudden moment of clear understanding or realization, often used to describe a turning point for a character.
One part of a television or radio series, or a single event in a longer story.
Relating to the theory of knowledge, especially how we know what we know and how reliable it is.
The branch of philosophy concerned with the nature, sources, and limits of knowledge.
Written in the form of letters, diary entries, or similar personal documents.
The same in amount, size, value, or status as something else.
The state of being equal, especially in rights, opportunities, and treatment.
A calm, composed state of mind, especially in a difficult situation.
A mathematical statement showing that two expressions are equal, usually written with an equals sign.
An imaginary line around the middle of the Earth, halfway between the North and South Poles.
Having all sides of equal length, used especially to describe a triangle.
A triangle with all three sides the same length and all three angles equal.
A state of balance between opposing forces or influences.
A number that expresses the ratio of product to reactant concentrations at equilibrium for a given reversible reaction.
One of the two times a year when day and night are nearly equal in length everywhere on earth.
The tools, machines, or other items needed for a particular purpose or activity.
Fair to everyone involved, especially in the way something is shared or distributed.
Fairness and justice in the way people are treated, or the value of ownership someone holds in property or a company.
Equal in value, meaning, or importance to something else.
To use vague or ambiguous language to avoid giving a clear or committing answer.
A period of time known for particular events, developments, or characteristics.
A small piece of rubber used to remove pencil marks.
To gradually wear away, or to gradually reduce or destroy something.
The gradual wearing away of soil, rock, or land, usually by wind, water, or ice.
Not following a regular or predictable pattern, changing suddenly and without an obvious reason.
Wrong; based on a mistake.
A mistake, especially one caused by carelessness or lack of knowledge.
Made or used as a substitute, usually of lower quality than the real thing.
Having or showing great knowledge, gained mainly through study.
A sudden, often violent release, especially of lava from a volcano.
To get free from a place, situation, or danger.
To deliberately avoid using or doing something.
Understood or of interest to only a small, specialized group of people.
More than usual, or particularly, when talking about one thing among others.
A short piece of writing on a particular subject.
Absolutely necessary, something a situation cannot do without.
To set something up so it becomes permanent or accepted, or to prove a fact.
To roughly calculate the value, size, or amount of something without measuring it exactly.
A rough judgment or calculation of a value, amount, or quality.
A hormone that plays a key role in female reproductive development, produced mainly in the ovaries.
The wide area where a river meets the sea, where fresh water and salt water mix.
Relating to what is morally right and wrong, or following accepted standards of good behaviour.
A situation in which a person must choose between two conflicting moral principles.
The study of moral principles that determine right and wrong behavior.
Relating to a group of people who share the same race, nationality, culture, or language.
The forced removal or killing of people from a particular ethnic or religious group in order to make an area ethnically uniform.