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authentic real, genuine, or true.
author the writer of a book, play, story, or other written work.
authoritative having or showing authority. [2 definitions]
authority the right or power to give orders, make decisions, or control people. [3 definitions]
authorize to give authority to. [2 definitions]
auto see "automobile."
auto- a prefix that means done by oneself or itself.
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. an abbreviation for Avenue.