D defs.my
Entry 2 senses Webster, 1913

Alternately

/ôl'-tẽrn-ət-lē/ · Al·ter·nate·ly · IPA /ˈɔl.tɚ.nət.li/
01 adv. In reciprocal succession; succeeding by turns; in alternate order.
  1. 1.
    In reciprocal succession; succeeding by turns; in alternate order.
  2. 2.
    By alternation; when, in a proportion, the antecedent term is compared with antecedent, and consequent.(Math.)