Oxford Dictionary English the International Date Line nounnoun BrE BrE//ði ɪntəˌnæʃnl ˈdeɪt laɪn// ; NAmE NAmE//ði ɪntərˌnæʃnl ˈdeɪt laɪn// (also Date Line) [singular] Add to my wordlistjump to other results enlarge image the imaginary line that goes from north to south through the Pacific Ocean. The date on the west side is different by one day from that on the east side. Wordfinderearthclimate, earth, equator, equinox, hemisphere, International Date Line, latitude, map, planet, tropicSee the International Date Line in the Oxford Advanced American DictionaryCheck pronunciation: the International Date Line oxfordlearnersdictionaries.com