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Definition of menstruation noun from the Oxford Advanced Learner's Dictionary

menstruation

noun
 
/ˌmenstruˈeɪʃn/
 
/ˌmenstruˈeɪʃn/
[uncountable] (formal)
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  1. the process or time of menstruating compare period
See menstruation in the Oxford Advanced American Dictionary
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verb
 
 
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