Antemeridian

Part of speech: adjective

Definitions

1. Occurring or existing in the hours between midnight and noon
2. Relating to the time period that takes place before midday
3. Characterizing the segment of the day from midnight until noon

Etymology: Antemeridian is a Latin compound: "ante" meaning "before" and "meridies" meaning "midday" or "noon," with "meridies" itself built from "medius" (middle) and "dies" (day). Literally, it means "before midday," and the term was formed on the same pattern as its opposite, "postmeridian," meaning after noon. The word is a learned coinage rather than something that came down through everyday speech. Its use is tied to the astronomical and timekeeping practice of dividing the day into two halves around noon, which is why it appears mostly in technical, legal, and formal contexts such as "antemeridian" hours on a clock or a schedule.