a.m.
午前
解説 Definition
正午より前の時刻であることを示す略語。数字で示した時刻の直後に置き、午前と午後を区別する。
A.m. is placed after a clock time to show that it falls between midnight and noon in the twelve-hour system. It distinguishes a morning or pre-noon time from the corresponding p.m. time.
覚え方のコツ Memory Tip
a.m.のaはante「前」と結び付け、「正午より前」と覚えると確実です。必ず7 a.m.のように時刻の後ろに置きます。対になるp.m.はpost meridiem「正午より後」です。特に12 a.m.は午前0時、12 p.m.は正午なので、この組み合わせも一緒に確認すると混乱を防げます。
Remember that the a in a.m. begins ante, the Latin word for “before”: a.m. means before noon. Put it after the time, as in 7 a.m., 9 a.m., or 10:30 a.m. Pair it with p.m., from post meridiem, meaning after noon. The main trap is twelve o’clock: 12 a.m. is midnight, while 12 p.m. is noon. Styles vary—AM, am, and a.m. are all seen—so follow the style required by the document, but keep the time meaning unchanged.
例文
I get up at 7 a.m. every day.
私は毎朝7時に起きます。
The store opens at 9 a.m.
その店は午前9時に開きます。
Our flight leaves at 10:30 a.m.
私たちの便は午前10時30分に出発します。
a.m. の語源・成り立ち Etymology
ラテン語 ante meridiem「正午より前」の略です。anteは「前」、meridiemは「正午」を意味します。英語では時刻の後に置き、表記はa.m.のほか、AMやamも使われます。
A.m. abbreviates the Latin phrase ante meridiem, meaning “before midday.” Ante means “before,” while meridiem is a form of meridies, “midday” or “noon.” English adopted the abbreviation for the twelve-hour clock, placing it after a numerical time to identify the period from midnight up to noon. Modern style conventions also permit forms such as AM and am, with or without punctuation depending on the publication.
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