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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."
auxin any of a group of organic compounds, often plant hormones, that affect plant growth.
AV abbreviation of "audio-visual," having both sound and a picture, as does film.
Av the eleventh month of the Jewish lunisolar calendar, occurring from late July through early August in the Gregorian calendar.
avail to be useful or profitable to; be of value to. [3 definitions]
availability the condition of being available.
available able to be had for use or purchase; at hand. [2 definitions]
avail oneself of to make use of to one's advantage.
avalanche the sudden rush of a large quantity of snow, ice, or rocks down a mountain. [4 definitions]
avant-garde a group that actively experiments with and applies new and unconventional techniques, esp. in the arts; vanguard. [3 definitions]
avarice the excessive desire to accumulate riches; greed; cupidity.
avaricious marked by avarice; greedy, esp. for wealth; grasping.
avascular lacking blood vessels.
avast used in nautical terminology as a command to stop.
avatar in Hindu mythology, a human incarnation of a god. [2 definitions]
avdp. abbreviation of "avoirdupois," a system of weight based on a pound equal to sixteen ounces or to 453.59 grams.
Ave. abbreviation of "Avenue," a street, esp. a wide one (written as part of a proper name).
ave Hail!; Hello!; Welcome! (used mainly in religious ceremony). [4 definitions]
Ave Maria (Latin) Hail Mary; the opening words of a prayer to the Virgin Mary. [2 definitions]
avenge to inflict punishment or cause suffering as retribution for; take vengeance for. [2 definitions]