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Children's Dictionary
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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.
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]