Source : Webster's Revised Unabridged Dictionary (1913)

Matutinal \Mat`u*ti"nal\, a. [L. matutinalis, matutinus: cf. F.
   matutinal. See {Matin}.]
   Of or pertaining to the morning; early.

Source : WordNet®

matutinal
     adj : pertaining to or occurring in the morning; "took his
           matutinal walk"