| accusation |
a statement that another person is guilty of a crime or error. |
| ace |
a playing card that has only one mark. In card games, an ace has either the highest value of all the cards or the lowest. [2/5 definitions] |
| acid |
a chemical substance that dissolves in water, has a sour taste, and turns blue litmus paper red. [1/4 definitions] |
| acid rain |
rain that contains acid from pollution. |
| acknowledge |
to reply to; say that one has received. [1/3 definitions] |
| acne |
a skin condition that makes pimples appear on the face, back, or chest. It happens when oil glands in the skin are blocked. |
| acoustics |
the aspects of a room or space that make sounds easy or difficult to hear (used with a plural verb). |
| acquaintance |
knowledge of something that comes from personal experience. [1/2 definitions] |
| acrobat |
a person who can do physical acts that take balance and skill. |
| act |
a thing that is done; deed. [2/9 definitions] |
| action |
something that is done for a particular purpose. [2/6 definitions] |
| action verb |
a verb that shows its subject performing some action. "Run," "eat," "fly," and "sing" are examples of action verbs. |
| actively |
in a way that involves making an effort, taking action, or participating. |
| activity |
a thing that people spend time doing. [1/2 definitions] |
| actual |
truly existing, or being something that is real or true. |
| A.D. |
after the birth of Jesus Christ. A.D. is an abbreviation for anno domini, which means "in the year of the Lord" in Latin. Something that happened in A.D. 50 happened fifty years after the birth of Christ. |
| ad |
a short form of "advertisement," a public notice that tells people about products for sale, events, employment opportunities, or the like. |
| adage |
an old familiar saying that shows the wisdom of a group of people; proverb. |
| adaptation |
a particular change in the body of a living thing that helps the animal or plant to survive under new conditions. An adaptation happens over a very long time. [1/4 definitions] |
| addict |
a person who depends on something, such as a drug, that is usually harmful and cannot be easily given up. [2/3 definitions] |
| addiction |
the condition of being addicted, especially to something that is not good for one's health. |