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  1.                 From The Collaborative International Dictionary of English v.0.48:
                    

    Altern \Al"tern\, 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]