Third person singular present tense of 'circularize': makes circular or distributes to many people via circulars (American spelling).
From 'circularize' plus '-s,' the third person singular present tense marker in English. One of the most regular and consistent features of English grammar.
The '-s' ending for 'he/she/it' is a remnant of Old English conjugation systems that have been stripped away; it's literally a grammatical fossil from languages like German that still keep their verb endings.
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