meridiem

Etymology
From, accusative of , as in the phrases and  (more commonly  and ).

Noun

 * 1)  Midday, noon.
 * 2)  Either a.m. or p.m.
 * 1)  Either a.m. or p.m.
 * 1)  Either a.m. or p.m.
 * 1)  Either a.m. or p.m.
 * 1)  Either a.m. or p.m.
 * 1)  Either a.m. or p.m.

Etymology
, as in the phrases ante meridiem and post meridiem (more commonly and ).

Adverb

 * 1) midday, noon