| autobiography |
the story of a person's life written or told by that person. |
| autograph |
the name of a person, especially a famous person, written in his or her own handwriting. [2 definitions] |
| automated teller machine |
a computerized machine used for banking. |
| automatic |
working or operating by itself. [2 definitions] |
| automation |
the use of machines rather than people to do work. |
| automobile |
a vehicle with four wheels that is powered by a motor that uses gasoline or other fuel; car. An automobile is used on roads to carry people. |
| autopsy |
a medical examination of a dead body to find the cause of death. |
| autumn |
the season of the year between summer and winter; fall. |
| auxiliary |
serving as an extra means of support; additional. [3 definitions] |
| auxiliary verb |
a verb used with a main verb to complete the main verb's meaning. Some examples of auxiliary verbs are "have" in "I have escaped" and "should" in "You should go." |
| availability |
the condition of being available. |
| available |
able to be used or possible to get. |
| avalanche |
the sudden rush of a large amount of snow, ice, or rocks down a mountain. [2 definitions] |
| Ave. |
abbreviation of "Avenue." |
| avenue |
a wide street. |
| average |
a usual amount or kind; something that is not outside the ordinary. [7 definitions] |
| average out |
to amount to an arithmetic average (usually followed by "to"). [2 definitions] |
| avert |
to turn away or aside. [2 definitions] |
| aviation |
the act, practice, or science of flying airplanes. |
| aviator |
a person who flies an aircraft; pilot. |
| avid |
having an eager desire for; greedy. [2 definitions] |