Meridiem

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Midday, noon. rare, uncountable

    "Quantities and frequencies are distributed as follows (neglecting the meridiem hour):[…]"

  2. 2
    The property of a timestamp of being either a.m. or p.m. countable

    "The terminal responds N HH MM CR where N, HH, and MM are the meridiem, hour, and minutes, as above."

Synonyms

All synonyms
high noonhigh noonmeridianmeridianmiddaymiddle day

Example

More examples

"Quantities and frequencies are distributed as follows (neglecting the meridiem hour):[…]"

Etymology

Back-formation from the phrases ante meridiem and post meridiem (more commonly a.m. and p.m.), from Latin merīdiem, accusative of merīdiēs (“midday, noon”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.