mensis

• (Classical Latin) IPA^(key): [ˈmẽː.sɪs]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈmɛn.sis]

From Proto-Italic *mēnsis, extended from *mēns, from Proto-Indo-European *mḗh₁n̥s (“moon, month”), probably from *meh₁- (“to measure”), referring to the moon's phases as the measure of time. Cognate with Ancient Greek μήν (mḗn), μήνη (mḗnē), English month, Scots moneth (“month”), Lithuanian mėnesis (“month”), North Frisian muunt (“month”), Saterland Frisian Mound (“month”), Dutch maand (“month”), German Low German Maand, Monat (“month”), German Monat (“month”), Danish måned (“month”), Swedish månad (“month”), Icelandic mánuður (“month”), Armenian ամիս (amis), Old Irish mí, Old Church Slavonic мѣсѧць (měsęcĭ).

mēnsis m (genitive mēnsis); third declension

1. month

   intrā mēnsem ― before the end of the month

Third-declension noun (i-stem).

• mēnstruus
• mēnsuālis

See the etymology of the corresponding lemma form.

mēnsīs f

1. dative/ablative plural of mēnsa

See the etymology of the corresponding lemma form.

mēnsīs

1. dative/ablative masculine/feminine/neuter plural of mēnsus

• “mensis”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “mensis”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• "mensis", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• mensis in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • to hold out for four months: obsidionem quattuor menses sustinere
    
  • (ambiguous) the intercalary year (month, day): annus (mensis, dies) intercalaris
    
• “mensis”, in Harry Thurston Peck, editor (1898), Harper’s Dictionary of Classical Antiquities, New York: Harper & Brothers
• “mensis”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin