( often initial capital letter ) matins. Also, especially British , mattins. ( usually used with a singular verb ) Ecclesiastical .

the first of the seven canonical hours.

the service for it, properly beginning at midnight, but sometimes beginning at daybreak.

Also called Morning Prayer. the service of public prayer, said in the morning, in the Anglican Church.

Archaic . aubade.

Also, matinal. pertaining to the morning or to matins.