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The reciprocal succession of (normally two) things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence
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(religion) The response of the congregation speaking alternately with the minister.
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(phonology) Ablaut.
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(linguistics) A pattern by which more than one construct is possible, as with "Alice cooked Bob dinner" and "Alice cooked dinner for Bob".
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(logic) The "inclusive or" truth function.
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(mathematics) A sequence that alternates between positive and negative values.
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(mathematics, proscribed) A permutation.
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(computing) A construct in a regular expression that can match any of several specified subexpressions.
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(geometry) A type of partial truncation of a polygon, polyhedron or tiling in which alternate vertices are removed.