The Collaborative International Dictionary of English v.0.48:
Matutinal \Mat`u*ti"nal\, a. [L. matutinalis, matutinus: cf. F. matutinal. See Matin.] Of or pertaining to the morning; early. [1913 Webster]WordNet (r) 3.0 (2006):
matutinal adj 1: pertaining to or occurring in the morning; "took his matutinal walk"