(historical) A round dance accompanied by singing.

A ballad or song of joy, specifically a traditional religious or secular song sung at christmastime.

(architecture) Alternative form of carrel (“small closet or enclosure built against a window on the inner side, to sit in for study”).

(intransitive, historical) To participate in a carol (a round dance accompanied by singing).

(intransitive) To sing in a joyful manner.

(intransitive) To sing carols; especially to sing Christmas carols in a group.

(transitive) To praise or celebrate in song.

(transitive) To sing (a song) cheerfully.