line of longitude
an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator - all points on the same meridian have the same longitude • Syn: meridian • Derivationally related forms: meridional (for: meridian) • Hypernyms: great circle • Hyponyms: observer's meridian, prime meridian, magnetic meridian • Instance Hyponyms: dateline, date line, International Date Line
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