A.M.
/'ei'em/
Definition
Adverb:
- Before noon, in the morning: Used after a time to indicate that it is a time between midnight (12:00) and noon (11:59). It is the period from 12:00 midnight to 11:59 in the morning.
Adjective:
- Occurring before noon: Describing an event or time that happens in the morning, before 12:00 noon.
Examples of Usage
Adverb:
- The meeting is scheduled for 9:00 a.m.
- The store opens at 7:30 a.m. every day.
Adjective:
- The a.m. hours are usually quieter.
- She prefers a.m. flights for travel.
Advanced Usage
"12 a.m.": Refers to midnight, the start of the day.
- The deadline is 12 a.m. on Friday. (Meaning Friday begins at that moment).
In formal/technical contexts: Often written in the lowercase forms "a.m." or "am", and sometimes without periods as "am".
- The experiment ran from 6 am to 11 a.m.
Variants and Related Words
- ante meridiem: The full Latin phrase from which "a.m." is derived, meaning "before midday".
- AM: A common capitalized variant, especially in digital displays.
- The clock read 10:15 AM.
Synonyms
- Morning: The early part of the day, from sunrise to noon.
- Forenoon: A somewhat formal term for the part of the day before noon.
Notes on Usage
- Capitalization: Can be written in uppercase (A.M.), lowercase (a.m.), or small capitals. Consistency within a document is key.
- Punctuation: Traditionally uses periods (a.m.), but the periods are often omitted in informal or digital contexts (am).
- With "12": "12 a.m." specifically denotes midnight. To avoid confusion, "midnight" is often used instead.
- Spacing: Typically, a space is used between the time number and "a.m." (e.g., 10 a.m.), though writing it without a space (10am) is also common.
- Opposite: The opposite period is p.m. (post meridiem), meaning "after noon".
Adverb
-
before noon
-
let's meet at 11 A.M.
-
Adjective
-
before noon
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