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The Collaborative International Dictionary
Alternant

Alternant \Al*ter"nant\, a. [L. alternans, p. pr.: cf. F. alternant. See Alternate, v. t.] (Geol.) Composed of alternate layers, as some rocks. [1913 Webster] ||

Wiktionary
alternant

a. 1 alternate from one row of a matrix to another. 2 (context geology English) Composed of alternate layers, like certain rocks. n. 1 (context linguistics English) An alternate form or allomorph. 2 (context mathematics English) A determinant which is an alternating function.