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 ]