meridiems

Noun

meridiem (countable and uncountable, plural meridiems)

1. (rare, uncountable) Midday, noon.
   • Quantities and frequencies are distributed as follows (neglecting the meridiem hour):[…]1919, J. R. Sutton, “A Lunar Period in the Rates of Evaporation and Rainfall?”, in Transactions of the Royal Society of South Africa, volumes VII (1918–19), Cape Town: the Society, page 108
2. (countable) The property of a timestamp of being either a.m. or p.m.
   • The terminal responds N HH MM CR where N, HH, and MM are the meridiem, hour, and minutes, as above.1986 March, “Operation”, in Ampex 230 plus: Video Display Terminal: Operation Manual, section 10 (Setting the Time), page 3-42