a combining form occurring in loanwords from Latin (universe ), used, with the meaning “one,” in the formation of compound words (unicycle ).

< Latin ūni- combining form of ūnus one; see -i-

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World English Dictionary
combining form
consisting of, relating to, or having only one: unilateral; unisexual
[from Latin ūnus one]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

comb. form meaning "having one only," from L. uni-, comb. form of unus (see one).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

uni- pref.
Single; one: univalent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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