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English

From Middle English -ik, from Old French -ique, from Latin -icus, from Proto-Indo-European *-ikos, *-iḱos, formed with the i-stem suffix *-i- and the adjectival suffix *-ko-. Compare Ancient Greek -ικός (-ikós), Sanskrit (śa), (ka) and Old Church Slavonic -ъкъ (-ŭkŭ). Doublet of -y.

PIE *-ko- on noun stems carried the meaning 'characteristic of, like, typical, pertaining to', and on adjectival stems it acted emphatically.

Catalan

From Latin -icus.

Romanian

From Latin -icus.