Is it ensure, insure, or assure?
1961, abbreviation of mini-car, a small car made by British Leyland (formerly British Motor Corp.). As an abbreviation of miniskirt, it is attested from 1966. The vogue for mini- as a prefix in English word coinage dates from c.1960.
Small; miniature: minilaparotomy.
: She looked out of place in her mini dressnoun
used to form nouns Small; miniature; short: minibus/ minicab/ minivan/ minicam/ minishegoss or meshugas) Craziness; absurdities: a mishegoss of mixed-up crap/ and free-lance mishigas/ Mailer's old meshugas about cancer
[1890s+; fr Yiddish fr Hebrew]