meridiem
Latin for midday
Meridiem is the Latin word for midday, appearing in English almost exclusively in the abbreviations a.m. (ante meridiem, before midday) and p.m. (post meridiem, after midday).
The full word occasionally appears in formal or humorous contexts: We shall convene at eleven ante meridiem.
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- postVertical structural beam
- AMPre-midday designation
- PMAfter-midday time marker
- noonDay's exact middle
midnight · twelve · clock · hour · notation · designation · indicator · timestamp
Twelve hours after midnight
- lunchtimeNoon eating period
- siestaMidday rest
- sunshineDirect rays from above
- noondayTwelve o'clock daytime
peak · apex · solar noon · lunchbreak · heat · daylight · bright · noontime
Point straight overhead
- nadirLowest possible point
- celestialOf the sky above
- eclipticSun's apparent annual path
- solsticeDay of maximum tilt
equinox · declination · azimuth · transit · culmination · sidereal · longitude · latitude
Daily biological cycle
- rhythmPatterned stress and silence
- biologicalRelating to living organisms
- clockDevice displaying time
- diurnalActive during daylight
nocturnal · chronotype · melatonin · sleep-wake · entrainment · jetlag · alertness · drowsiness
ante
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noon · midnight · twelve · clock · hour · notation · designation · indicator · timestamp · schedule
midday
Twelve hours after midnight
noonday · peak · apex · solar noon · lunchbreak · heat · daylight · bright · noontime
zenith
Point straight overhead
solstice · equinox · declination · azimuth · transit · culmination · sidereal · longitude · latitude · tropic
circadian
Daily biological cycle
- rhythmPatterned stress and silence
- biologicalRelating to living organisms
- clockDevice displaying time
diurnal · nocturnal · chronotype · melatonin · sleep-wake · entrainment · jetlag · alertness · drowsiness · wakefulness
witching hour
Time of supernatural activity
nocturnal · moonlight · stars · nightfall · slumber · dreams · quiet · eerie · owl · nighttime
- prime meridianZero-degree longitude line
- Greenwich meridianZero-degree longitude line