Word library
8,130 words, searchable by word, definition, part of speech, and CEFR level.
An economic system that combines private enterprise with a significant degree of government ownership or regulation.
A combination of different things or substances put together.
A technique, such as a phrase or rhyme, used to help remember information.
To organize and prepare people or resources for action, especially for war or a cause.
A helping verb, such as 'can', 'must', or 'should', that adds meaning like ability, permission, or necessity to a main verb.
In a set of grouped data, the class or interval that occurs most frequently.
A type of verb, such as "can", "must", or "should", used with another verb to express ability, necessity, or possibility.
A particular way or state in which something operates, or a method of doing something.
The general purpose and approach behind a piece of writing, such as to narrate, describe, persuade, or explain.
A small copy of something, or a person who shows off clothes or poses for pictures.
Neither too much nor too little, staying within reasonable limits.
Belonging to the present time, using the newest ideas or methods.
A movement in art, literature, and architecture from the late 1800s and early 1900s that deliberately broke with traditional styles in favor of experimentation and new forms.
To make something more up to date by introducing new methods, ideas, or equipment.
To make small changes to something in order to improve it or make it suitable for a new purpose.
Made up of separate, standardized parts that can be combined, replaced, or rearranged independently.
A small amount of water present in the air, in a substance, or on a surface.
A measure of how much of a substance is dissolved in a given volume of solution, expressed in moles per liter.
The mass of one mole of a substance, usually measured in grams per mole.
The volume occupied by one mole of a substance, especially a gas, under specified conditions of temperature and pressure.
The SI unit for the amount of a substance, equal to a fixed number of particles, roughly 6.02 times ten to the twenty-three.
The branch of biology that studies living things at the level of molecules, especially DNA, RNA, and proteins.
The smallest unit of a substance that still has all the chemical properties of that substance, formed when two or more atoms join together.
To calm someone down or reduce their anger.
Melted by heat into a hot liquid form, especially describing rock or metal.
An informal word for mother.
A very short period of time, or a particular point in time.
The force that keeps something moving or developing, or the strength gained from a series of successes.
The physical principle that the total momentum of a closed system stays the same unless an outside force acts on it.
A king or queen who rules a country.
A form of government headed by a king or queen, whose position is usually inherited.
The day of the week that comes after Sunday and before Tuesday, usually the first day of the working week.
Coins and paper notes used to buy and sell things.
A small, quick mammal known for its ability to fight and kill snakes.
To watch or check something closely over a period of time.
A furry animal with a long tail that lives in trees and is closely related to apes.
A playground structure made of horizontal bars that children hang from and swing across.
Relating to a single culture, or in farming, growing only one crop over a large area.
The practice of having only one romantic or sexual partner at a time.
A long speech given by a single character or speaker, often expressing private thoughts, uninterrupted by anyone else.
A small molecule that can join with many others of the same or a similar kind to form a long chain called a polymer.
A market structure with many sellers offering similar but not identical products, each with some ability to set its own price.
Complete control of the trade or production of a particular product or service by one company or group.
The belief that there is only one god.
A season of heavy rain and strong winds that occurs in certain regions, especially South Asia.
An imaginary creature that is large, ugly, and frightening.
One of the twelve parts that make up a year.
The plural of "month", one of the twelve periods of time that make up a year.