Noun. Description of the state of times before or after noon in the 12-hour clock. Can be either
ante meridiem (A.M.) or post meridiem (P.M.)
The term meridiemem was first defined and used in
Chicago, on Oct. 20th 2011 by Benjamin Michael
Brown, Piotr Bieszk, and Shavar Beckford.
Q: Which meridiemem describes the time before
noon?
A: The "AM" meridiemem describes times before
noon. The meridiemem "PM" describes times after
noon.