The Collaborative International Dictionary
Antemeridian
Antemeridian \An`te*me*rid"i*an\, a. [L. antemeridianus; ante + meridianus belonging to midday or noon. See Meridian.] Being before noon; in or pertaining to the forenoon. (Abbrev. a. m.)
Wiktionary
antemeridian
a. Of or relating to morning; that happens in the morning.
WordNet
antemeridian
adj. before noon [ant: postmeridian]
Usage examples of "antemeridian".
As I went through my antemeridian routine, I discovered that I harbored the same mixed mood that had pervaded my weekend, and I can only describe it as being precariously happy.