Date Line

Century Dictionary and Cyclopedia

1. n. The boundary-line between neighboring regions where the calendar day is different. This line runs through the Pacific ocean, and is supposed to coincide with the meridian of 12 hours or 180° from Greenwich; but it practically follows a somewhat devious course, and is sometimes confused. Thus the Sundays of the Russian and of the American settlers in Alaska formerly fell upon different days. On the east of the date-line the nominal date is one day earlier than on the west of it; so that the American Sunday in Alaska coincides with the former Russian Monday.

GNU Webster's 1913

1. The hypothetical line on the surface of the earth fixed by international or general agreement as a boundary on one side of which the same day shall have a different name and date in the calendar from its name and date on the other side. Also called International Date Line.

WordNet 3.0

1. n. an imaginary line on the surface of the earth following (approximately) the 180th meridian
2. n. an imaginary line on the surface of the earth following (approximately) the 180th meridian
3. v. mark with a date and place
4. n. a line at the beginning of a news article giving the date and place of origin of the news dispatch