8 letters · 9 points in Scrabble
noun an imaginary line on the surface of the earth following (approximately) the 180th meridian
noun a line at the beginning of a news article giving the date and place of origin of the news dispatch
verb mark with a date and place
originEtymology tree English date Middle French lignerbor. English line English dateline From date + line.
Etymology from Wiktionary, CC BY-SA 3.0