Hypertext Webster Gateway: "Altern"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Altern \Al"tern\, a. [L. alternus, fr. alter another: cf. F.
alterne.]
Acting by turns; alternate. --Milton.
{Altern base} (Trig.), a second side made base, in
distinction from a side previously regarded as base.
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