antimeridian.
The reference line at 180° longitude, on the opposite side of earth to the prime meridian.
Meaning & usage
The reference line at 180° longitude, on the opposite side of earth to the prime meridian.
A meridian of longitude opposite to any given meridian used as a point of reference.
123° west is the antimeridian of the 57° east meridian.
Where this word comes from
From anti- + meridian.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.