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

 

milli-

 combining form
combining form
BrE BrE//ˈmɪli//
 
; NAmE NAmE//ˈmɪli//
 
 
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(in nouns; used in units of measurement) one thousandth milligram Word Originfrom Latin mille ‘thousand’.
See the Oxford Advanced American Dictionary entry: milli-