What is the definition of menarche
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Menarche (/mɪˈnɑːrkiː/ mi-NAR-kee; Greek: μήν mēn "month" + ἀρχή arkhē "beginning") is the first menstrual cycle, or first menstrual bleeding, in female humans. ... The timing of menarche is influenced by female biology, as well as genetic and environmental factors, especially nutritional factors.
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The onset of menstruation in a human female is known as menarche.
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