"pertaining to or belonging to a colony," 1756, from Latin colonia (see colony) + -al (1), or directly from colony on model of baronoinal. In U.S., especially "from or characteristic of America during colonial times" (1776). The noun meaning "inhabitant of a colony, a colonist" is recorded from 1816.
coral is a colonial organism
collywobbles
cologne
Colombia
colon
colonel
colonial
colonialism
colonialist
colonialization
colonic
colonisation