mat ‧ ins BrE AmE , mattins /ˈmætənz, ˈmætɪnz $ ˈmætnz/ noun [uncountable]
[ Date: 1200-1300 ; Language: Old French ; Origin: matines , from Latin matutinus 'of the morning' ]
the first prayers of the day in the Christian religion SYN morning prayer
mat ‧ ins BrE AmE , mattins /ˈmætənz, ˈmætɪnz $ ˈmætnz/ noun [uncountable]
[ Date: 1200-1300 ; Language: Old French ; Origin: matines , from Latin matutinus 'of the morning' ]
the first prayers of the day in the Christian religion SYN morning prayer
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012