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mini-

  1. a combining form with the meanings “of a small or reduced size in comparison with others of its kind” (minicalculator; minicar; minigun); “limited in scope, intensity, or duration” (miniboom; minicourse; minirecession); (of clothing) “short, not reaching the knee” (minidress; miniskirt).
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Origin of mini-

by shortening of miniature, minimal, or minimum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for mini-

mini-

combining form
  1. smaller or shorter than the standard sizeminibus; miniskirt
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Word Origin

C20: from miniature and minimum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mini-

word-forming element meaning "miniature, minor," abstracted from miniature, with sense perhaps influenced by minimum.

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Online Etymology Dictionary, © 2010 Douglas Harper

mini- in Medicine

mini-

pref.
  1. Small; miniature:minilaparotomy.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.