| authentic |
real, genuine, or valid. [2 definitions] |
| author |
the writer of a book, play, story, or the like. [3 definitions] |
| authoritative |
having or displaying authority. [2 definitions] |
| authority |
the right, power, or ability to give orders, make decisions, or demand or compel obedience. [5 definitions] |
| authorize |
to give authority for or to; grant power to. [2 definitions] |
| autism |
a developmental disorder usually becoming detectable in very early childhood that is characterized especially by atypical acquisition or use of language as well as atypical patterns of social interaction. |
| auto |
shortened form of "automobile." |
| auto- |
self; same. |
| autobiography |
the events of a person's life written or told by that person. |
| autograph |
a signature, esp. that of a famous person. [4 definitions] |
| automated teller machine |
a computerized machine serving the function of a bank teller. |
| automatic |
acting by itself without outside power or influence. [4 definitions] |
| automation |
operation by machinery rather than by people. |
| automobile |
a four-wheeled vehicle with a built-in, self-propelled motor requiring a driver and used on roads to carry people; passenger car. |
| autopsy |
a superficial and surgical examination of a corpse, usu. to find the cause of death. [2 definitions] |
| autumn |
the season of the year between summer and winter, in the northern hemisphere continuing from the September equinox to the December solstice; fall. |
| auxiliary |
serving to help, assist, or support. [7 definitions] |
| auxiliary verb |
a verb used in conjunction with a main verb in a clause that assists the main verb in reflecting aspects, voices, moods, and tenses. In the sentence "They have escaped," the main verb is "escaped," and the auxiliary verb is "have." |
| availability |
the condition of being available. |
| available |
able to be had for use or purchase; at hand. [2 definitions] |
| avalanche |
the sudden rush of a large quantity of snow, ice, or rocks down a mountain. [4 definitions] |