| abandon |
to give up (one's home, fort, ship, or the like) by leaving it. [1/3 definitions] |
| accessory |
an item added on to something else to make it prettier, more complete, or more useful. [1/2 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. |
| adaptation |
in biology, the process of change in a living thing, over time, resulting in it being better able to survive and multiply. [1/4 definitions] |
| addict |
one who very much enjoys a hobby or interest and spends a lot of time and energy on it. [1/3 definitions] |
| additive |
a substance added to another substance in small amounts to change or improve it. |
| adjective |
a word that describes a noun or pronoun. In the sentence, "It was a hard test," the word "hard" is an adjective. It describes the noun "test." |
| adopt |
to become a parent of (a child) by law, or to accept an animal as a pet and become responsible for it. [1/3 definitions] |
| aerospace |
the earth's atmosphere and the space beyond it. |
| Africa |
the second largest continent. Africa is south of Europe and between the Atlantic and Indian Oceans. It is in the Eastern Hemisphere. |
| agitation |
the act or process of stirring up something, forcing it to move around or back and forth. [1/2 definitions] |
| air conditioning |
a system that cools air and takes dust and dampness out of it. Air conditioning is used inside buildings and cars. |
| air pressure |
the force of air on things. Air pressure has to do with how much force air has when it has been compressed into a space like a tire. It is also the pressure of the earth's atmosphere. |
| alcohol |
a clear liquid that burns easily and can be made from certain grains and fruits. Alcohol is present in such drinks as beer, wine, and whiskey. It is also used in making medicines and chemicals. [1/2 definitions] |
| alibi |
a way of defending oneself against criminal charges by showing that one was not at the scene of the crime when it happened. [1/2 definitions] |
| alimentary canal |
the tube in the body through which food travels as it is digested. The alimentary canal goes from the mouth to the anus, and includes the esophagus, the stomach, and the small and large intestines. |
| Amazon |
the longest river in South America. It flows from the Andes mountains in Peru across northern Brazil to the Atlantic Ocean. [1/2 definitions] |
| amber |
a hard, yellow or brown material that is used to make jewelry. It is a fossil that comes from the resin of pine trees. [1/2 definitions] |
| amen |
a word used at the end of a prayer or statement to mean "may it be so." |
| ampersand |
a sign (&). It is used in place of the word "and." |
| an |
another word for a. It is used before words that start with a, e, i, o, or u, or before words that begin with vowel sounds. |