Al‐ter″nate (?; 277), a. [L. alternatus, p. p. of alternate, fr. alternus. See Altern, Alter.] 1. Being or succeeding by turns; one following the other in succession of time or place; by turns first one and then the other; hence, reciprocal.
And bid alternate passions fall and rise.
Pope.
2. 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; as, the alternate members 1, 3, 5, 7, etc.; read every alternate line.
3. (Bot.) Distributed, as leaves, singly at different heights of the stem, and at equal intervals as respects angular divergence. Gray.
Alternate alligation. See Alligation. — Alternate angles(Geom.), the internal and angles made by two lines with a third, on opposite sides of it. It the parallels AB, CD, are cut by the line EF, the angles AGH, GHD, as also the angles BGH and GHC, are called alternate angles. — Alternate generation. (Biol.) See under Generation.