'Complin' definitions:

Definition of 'complin'

noun

Last of the seven canonical hours just before retiring [syn: compline, complin]

From: GCIDE

Compline \Com"pline\, Complin \Com"plin\, n. [From OE. complie, OF. complie, F. complies, pl., fr. LL. completa (prop. fem. of L. completus) the religious exercise which completes and closes the service of the day. See Complete.] (Eccl.) The last division of the Roman Catholic breviary; the seventh and last of the canonical hours of the Western church; the last prayer of the day, to be said after sunset. [1913 Webster]
The custom of godly man been to shut up the evening with a compline of prayer at nine of the night. --Hammond. [1913 Webster]