- dateline, date line, International Date Line - an imaginary line on the surface of the earth following (approximately) the 180th meridian
--1 is a kind of meridian, longitude, line of longitude
- dateline - a line at the beginning of a news article giving the date and place of origin of the news dispatch
--2 is a kind of line
--2 is a part of dispatch, despatch, communiqueDerived form: verb dateline1