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The Collaborative International Dictionary
Equi-

Equi- \E"qui-\ [L. aequus equal. See Equal.] A prefix, meaning equally; as, equidistant; equiangular.

Douglas Harper's Etymology Dictionary
equi-

before vowels equ-, word-forming element meaning "equal, having equal," from Latin aequi-, comb. form of aequus "equal, even" (see equal (adj.)).

Wiktionary
equi-

pre. equal