Definitions from Wiktionary (ALT)

▸ noun:  (music) Of a voice or instrument, high pitch; especially, the octave above the top line of the treble stave.
▸ noun:  (now archaic) A state of excitement, a heightened emotional condition.
▸ noun:  (Internet slang, gaming) An alternate or secondary character.
▸ noun:  (Internet slang) An alternate account.
▸ noun:  (finance) An alternative investment or alternative fund.
▸ noun:  Synonym of altbier
▸ noun:  (computing) A modifier key used to change (alternate) the function of other pressed keys.
▸ noun:  The River Alt, a river in West Lancashire and Merseyside, England, that flows into the Irish Sea.
▸ adjective:  Clipping of alternate. [Happening by turns; one following the other in succession of time or place; first one and then the other (repeatedly).]
▸ adjective:  Clipping of alternative, especially as a cultural phenomenon seen as being outside the mainstream of its genre. [Relating to a choice between two or more possibilities.]
▸ noun:  Clipping of altitude. [The absolute height of a location, usually measured from sea level.]
▸ noun:  (biochemistry) Initialism of alanine transaminase.

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