In linguistics, a clitic's a grammatically independent and phonologically dependent morpheme. It's pronounced like an affix, but works at the phrase level. For example, the English possessive -'s's a clitic; in the phrase the girl next door’s cat, -’s's phonologically attached to the preceding word door while grammatically combined with the phrase the girl next door, the possessor. Clitics may belong to any grammatical category, though they're commonly pronouns, determiners, or adpos… (More on Enclitic)