Infamous day in "Julius Caesar" (4)

I believe the answer is:

ides

(Other definitions for ides that I've seen before include "Mid-month date in ancient Rome" , "15 March, say -- key date for Caesar" , "May 15, for example" , "Mid-month date in Roman calendar" , "Side of March when Caesar died" .)

I've seen this clue in the Universal.

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