noun
(historical) A round dance accompanied by singing.
A ballad or song of joy.
(architecture, obsolete) A small closet or enclosure built against the inner side of a window of a monastery's cloister, to sit in for study.
verb
(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.