Where does “antimeridian” come from?

antimeridian (English) comes from English meridian, from Middle English meridian, from Middle French meridien, from Latin meridianus, from Latin merīdiēs, from Latin medīdiēs, from Latin diēs, from Proto-Italic djēm — to be bright; sky, heaven.

antimeridian (English): The reference line at 180° longitude, on the...

Definitions

  1. The reference line at 180° longitude, on the...

Ancestry of “antimeridian”, step by step

antimeridian traces back through 3 separate lines of ancestry.

via English meridian

StepLanguageWordMeaning
1EnglishmeridianThe south; Midday, noon; A great circle passing...
2Middle Englishmeridian
3Middle Frenchmeridienmidday; the south; celestial meridian
4Latinmeridianusmidday, noon; southern
5Latinmerīdiēsmidday, noon
6Latinmedīdiēs
7LatindiēsA day, particularly
8Proto-Italicdjēmaccusative singular of *djous
9Proto-Italic*djous
10Proto-Indo-Europeandyḗwssky, heaven; sky god
11Proto-Indo-Europeandyéwssky, heaven
12Proto-Indo-Europeandyew-to be bright; sky, heaven

via English anti

StepLanguageWordMeaning
1EnglishantiOpposed to something; That has a torsion angle...
2Englishanti-Against, hostile to; Contrasting with the norm;...
3Ancient Greekἀντι-anti-, against; like, reminiscent of
4Ancient Greekᾰ̓ντῐ́opposite

via French antiméridien

StepLanguageWordMeaning
1Frenchantiméridienantimeridian
2Frenchanti-anti
Every word from Proto-Indo-European dyew-Every word from Proto-Indo-European dyéwsEvery word from Proto-Indo-European dyḗws