Definition - A clitic that is joined to the end of a preceding word.
Note: Clitics are independent words that sometimes transform into dependent affixes (e.g. the word am when used as the 'm in I'm).

Example -
The word not becomes the enclitic 't when joined to a preceding verb — as in can't and shouldn't.

Etymology -
The word derives from the Greek enklitikos, throwing its accent back (from the Greek klinein, to lean).

Oxford English Dictionary -
Its first citation is from 1656:
"Enclitick, that inclines or gives back."
(Blount, Glossographia )

Please comment