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Longman Dictionary of Contemporary English
mini-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ a mini-market
▪ a miniskirt
Douglas Harper's Etymology Dictionary
mini-

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

Wiktionary
mini-

pre. 1 Denotes a smaller than usual version of an item. 2 With the hemline well above the knee.