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Ante Meridian is a misspelling of: Antimeridian , a meridian at 180° from another or the meridian opposite the prime meridian Ante meridiem , normally abbreviated a.m., Latin for "before midday"
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").
quaque ante meridiem q.d., qd every day / daily quaque die q.h.s., qhs every night at bedtime quaque hora somni q.d.s, qds, QDS 4 times a day quater die sumendum q.i.d, qid 4 times a day quater in die q.h., qh every hour, hourly quaque hora q.o.d., qod every other day / alternate days quaque altera die q.p.m., qPM, qpm every afternoon or evening
The Latin phrase “ante meridiem” means “before noon” or “before midday.” That’s why, in the 12-hour system, all times from midnight onward use this designation. PM stands for “post ...
Lesser-common Latin abbreviations and usages abbreviation or word Latin translation usage and notes AB Artium Baccalaureus "Bachelor of Arts" An undergraduate bachelor's degree awarded for either a course or a program in the liberal arts or the sciences, or both. a.C.n. ante Christum natum "before Christ"
Initially, the day was divided into two parts: the ante meridiem (before noon) and the post meridiem (after noon). With the introduction of the Greek sundial to Rome from the Samnites circa 293 BC, the period of the natural day from sunrise to sunset was divided into twelve hours. [1] [2] [3]
Before every meal (from Latin quaque ante cibum) q.a.d. every other day (from Latin quaque altera die) QALY: quality-adjusted life year: q.AM: every day before noon (from Latin quaque die ante meridiem) q.d. every day (from Latin quaque die) q.d.s. four times each day (from Latin quater die sumendus) q.h. each hour (from Latin quaque hora) q.h.s.
ante litteram: before the letter: Said of an expression or term that describes something which existed before the phrase itself was introduced or became common. Example: Alan Turing was a computer scientist ante litteram, since the field of "computer science" was not yet recognized in Turing's day. ante meridiem (a.m.) before midday