Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • Single; one: unicycle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • one, single

from the GNU version of the Collaborative International Dictionary of English

  • A prefix signifying one, once; as in uniaxial, unicellular.

Etymologies

Latin ūni-, from ūnus, one; see oi-no- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin uni-, combining form of unus ("one"). (Wiktionary)

Examples

  • The prefix uni- often means "characterized by one thing," but in this word and in the word unisex it is more like "both."

    Week in Words

  • The MacBook Pro line in early summer 2011 received new Sandy Bridge processors to accelerate proficiency with no aesthetic differences from previous uni- body design.

    Forbes.com: News

  • Just as the uni- prefix implies arrogance, multi- implies meekness, requiring Clinton’s secretary of state, Madeleine Albright, to come up with a toughening modifier: “assertive multilateralism.”

    The Right Word in the Right Place at the Right Time

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