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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]
avocado a tropical American fruit shaped like a pear. It has a green or black skin and a yellowish green pulp.
avoid to keep away from.
await to wait for; look forward to. [2 definitions]
awake to wake from sleep. [5 definitions]
awaken to wake from sleep. [2 definitions]
award to give as a prize or honor. [3 definitions]
aware knowing or careful (usually followed by "of").