Of, occurring in, or relating to the morning, especially the early morning upon waking up.
1874, Henry James, "Professor Fargo" in The Galaxy 18(2) (August 1874): 233–253.
[A] young lady was introduced who had come to request him to raise a ghost—a resolute young lady, with several ringlets and a huge ancestral umbrella, whose matutinal appetite for the supernatural had not been quenched by the raw autumnal storm.