| acoustics |
the aspects of a room or space that make sounds easy or difficult to hear (used with a plural verb). |
| acquaint |
to introduce or make familiar (usually followed by "with"). |
| acquaintance |
a person one has met but does not know well. [2 definitions] |
| acquire |
to get or come to have as one's own. |
| acquit |
to free from a charge of breaking the law; declare not guilty. |
| acre |
a unit of area equal to 43,560 square feet, used to measure land. The acre is a standard unit of measurement in the United States and the United Kingdom. |
| acreage |
the number of acres in an area of land. |
| acrobat |
a person who can do physical acts that take balance and skill. |
| acrobatic |
having to do with acrobats or feats of balance and skill. |
| acronym |
a word formed by putting together the first letters or parts of a series of words in a longer phrase. |
| acrophobia |
a very strong fear of high places. |
| across |
from one side to the other of. [5 definitions] |
| acrylic |
a kind of plastic used to make yarns, paint, and many other things. |
| act |
a thing that is done; deed. [9 definitions] |
| action |
something that is done for a particular purpose. [6 definitions] |
| action verb |
a verb that shows its subject performing some action. "Run," "eat," "fly," and "sing" are examples of action verbs. |
| activate |
to cause action in or make active; start. |
| active |
always doing something; busy; full of energy. [4 definitions] |
| actively |
in a way that involves making an effort, taking action, or participating. |
| activist |
a person who fights openly and vigorously for a cause. |
| activity |
the condition of being active or doing something. [2 definitions] |