Definition of multi- combining form from the Oxford Advanced Learner's Dictionary

 

multi-

 combining form
combining form
BrE BrE//ˈmʌlti//
 
; NAmE NAmE//ˈmʌlti//
 
 
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(in nouns and adjectives) more than one; many multicoloured a multimillionaire a multimillion-dollar business a multi-ethnic society Word Originfrom Latin multus ‘much, many’.
See the Oxford Advanced American Dictionary entry: multi-