Akademik

maxi
n. (pl. maxis) colloq. a maxi-coat, -skirt, etc.
Etymology: abbr.

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maxi 7 [maxi maxis] [ˈmæksi] [ˈmæksi] noun
a long coat, dress or skirt that reaches to the ankles
 
Word Origin:
1960s: abbreviation of maximum, on the pattern of mini.

Useful english dictionary. 2012.