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n 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; as, the alternation of day and night, cold and heat, summer and winter, hope and fear.

n The response of the congregation speaking alternately with the minister.

n (linguistics) ablaut

n (logic) The "inclusive or" truth function.

n (mathematics) A sequence that alternates between positive and negative values. (Sometimes wrongly used to mean a permutation.)