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Mon·day

(mŭndē, -dā′)

n. Abbr. Mon. or M

The day of the week that comes after Sunday and before Tuesday. In many countries and according to international standards, Monday is considered the first day of the week.

[Middle English, from Old English Mōnandæg (translation of Latin lūnae diēs, day of the moon) : mōnan, genitive of mōna, moon; see MOON + dæg, day; see DAY.]

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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