Etymology
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militate (v.)

1620s, of persons, "to serve as a soldier" (now rare), from Latin militatum, past participle of militare "serve as a soldier," from miles "soldier" (see military (adj.)). The sense developed via "to be in conflict with, be at variance" to "be evidence" for or against, "have weight or force in determining anything" (1640s). Related: Militated; militating; militation.

updated on January 17, 2019

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Definitions of militate from WordNet

militate (v.)
have force or influence; bring about an effect or change;
Politeness militated against this opinion being expressed
From wordnet.princeton.edu, not affiliated with etymonline.