a. [ L. alternus, fr. alter another: cf. F. alterne. ] Acting by turns; alternate. Milton. [ 1913 Webster ]

Altern base (Trig.), a second side made base, in distinction from a side previously regarded as base. [ 1913 Webster ]

n. Alternateness; alternation. [ R. ] Mitford. [ 1913 Webster ]

a. [ L. alternans, p. pr.: cf. F. alternant. See Alternate, v. t. ] (Geol.) Composed of alternate layers, as some rocks. [ 1913 Webster ]

‖n. [ F. ] A usage, among diplomats, of rotation in precedence among representatives of equal rank, sometimes determined by lot and at other times in regular order. The practice obtains in the signing of treaties and conventions between nations. [ Webster 1913 Suppl. ]

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. [ 1913 Webster ]

And bid alternate passions fall and rise. Pope. [ 1913 Webster ]

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. [ 1913 Webster ]

3. (Bot.) Distributed, as leaves, singly at different heights of the stem, and at equal intervals as respects angular divergence. Gray. [ 1913 Webster ]

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. [ 1913 Webster ]

n. 1. That which alternates with something else; vicissitude. [ R. ] [ 1913 Webster ]

Grateful alternates of substantial. Prior. [ 1913 Webster ]

2. A substitute; one designated to take the place of another, if necessary, in performing some duty. [ 1913 Webster ]

3. (Math.) A proportion derived from another proportion by interchanging the means. [ 1913 Webster ]

v. t. [ imp. & p. p. Alternated; p. pr. & vb. n. Alternating. ] [ L. alternatus, p. p. of alternare. See Altern. ] To perform by turns, or in succession; to cause to succeed by turns; to interchange regularly. [ 1913 Webster ]

The most high God, in all things appertaining unto this life, for sundry wise ends alternates the disposition of good and evil. Grew. [ 1913 Webster ]

v. i. 1. To happen, succeed, or act by turns; to follow reciprocally in place or time; -- followed by with; as, the flood and ebb tides alternate with each other. [ 1913 Webster ]

Rage, shame, and grief alternate in his breast. J. Philips. [ 1913 Webster ]

Different species alternating with each other. Kirwan. [ 1913 Webster ]

2. To vary by turns; as, the land alternates between rocky hills and sandy plains. [ 1913 Webster ]

adv. 1. In reciprocal succession; succeeding by turns; in alternate order. [ 1913 Webster ]

2. (Math.) By alternation; when, in a proportion, the antecedent term is compared with antecedent, and consequent. [ 1913 Webster ]

n. The quality of being alternate, or of following by turns. [ 1913 Webster ]