Mondays

1. 1
   noun

   Plural of Monday.

   The last few Mondays have been unusually quiet at the office.

   All the Mondays in February fell on even-numbered dates.

   Note

   The plural keeps the capital letter of the singular and takes numbers and determiners freely: three Mondays, those Mondays, all the Mondays in February. It is spelled exactly like the adverb meaning "each Monday", and the sentence shows which is which. In "open Mondays" it is the adverb. Add "on" to make "open on Mondays," and the same word becomes this noun, the object of the preposition.

2. 2
   adverbCanadaUS

   On Monday; on every Monday as a regular, recurring occurrence.

   She volunteers at the shelter Mondays before heading to work.

   The clinic only sees new patients Mondays and Thursdays.

   Note

   A North American habit of dropping the preposition: open Mondays, closed Mondays, Mondays to Saturdays. The final -s is an old adverb-forming suffix, not the plural ending it resembles, which is why no "on" is needed. It sits comfortably in timetables and opening hours. Outside the US and Canada, "on Mondays" is the safer choice.

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