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From WikiWord, the free dictionary

English

Definitions

High pitch, of a voice or instrument; especially, the octave above the top line of the treble stave.
A state of excitement, a heightened emotional condition.

Happening by turns; one following the other in succession of time or place; first one and then the other (repeatedly)“alternate picking is a guitar playing technique”
Designating the members in a series, which regularly intervene between the members of another series, as the odd or even numbers of the numerals; every other; every second.“the alternate members 1, 3, 5, 7, etc.”
Other; alternative.“He lives in an alternate universe and an alternate reality.”
(of leaves) Distributed singly at different heights of the stem, and at equal intervals as respects angular divergence.“Many trees have alternate leaf arrangement (e.g. birch, oak and mulberry).”

Relating to a choice between two or more possibilities.“an alternative proposition”
Other; different from something else.
Not traditional, outside the mainstream, underground.
Alternate, reciprocal.

The absolute height of a location, usually measured from sea level.“As the altitude increases, the temperature gets lower, so remember to bring warm clothes to the mountains.”
A vertical distance.
The distance measured perpendicularly from a figure's vertex to the opposite side of the vertex.“The perpendicular height of a triangle is known as its altitude.”
The angular distance of a heavenly body above our Earth's horizon.