antimeridian

[ an-tee-muh-rid-ee-uhn, an-tahy‐ ]
/ ˌæn ti məˈrɪd i ən, ˌæn taɪ‐ /

noun

the geographic meridian that lies 180° both east and west of the prime meridian, forming the great circle that divides the earth into the Eastern Hemisphere and the Western Hemisphere and serves as the meridian on which the International Date Line is based.

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Also called 180th me·rid·i·an [wuhn huhn-drid ey-tee-ith muh-rid-ee-uhn] /ˌwʌn ˈhʌn drɪd ˈeɪ ti ɪθ məˈrɪd i ən/ .
Compare antemeridian.

Origin of antimeridian

First recorded in 1810–15; anti- + meridian

WORDS THAT MAY BE CONFUSED WITH antimeridian

antemeridian, antimeridian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020