Dictionary.com

International Date Line

[ in-ter-nash-uh-nl deyt-lahyn ]
/ ˌɪn tərˈnæʃ ə nl ˈdeɪt ˈlaɪn /

noun

a theoretical line following, with occasional deviations, the antimeridian, the regions to the east of which are counted as being one day earlier in their calendar dates than the regions to the west.

QUIZZES

BECOME A PRO CHEF WITH THIS EXQUISITE CUISINE QUIZ!

Even if you can't be a professional chef, you can at least talk like one with this vocabulary quiz.
Question 1 of 9
You may have read the word "simmer" in a recipe or two, but what does it really mean?
To cook in water that begins cold and then reaches a boil.
To stew in a sauce for a long time.
To cook in water, just below boiling temperature.
TAKE THE QUIZ TO FIND OUT
Also called date line, Date Line [deyt-lahyn] /ˈdeɪt ˈlaɪn/ .
Compare antimeridian.

Origin of International Date Line

First recorded in 1875–80

Words nearby International Date Line

international candle, International Code, International Code of Signals, International Court of Justice, International Criminal Police Organization, International Date Line, International Development Association, Internationale, International Finance Corporation, International Geophysical Year, International Gothic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for International Date Line

International Date Line

noun

the line approximately following the 180° meridian from Greenwich on the east side of which the date is one day earlier than on the westAlso called: date line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for International Date Line

International Date Line
[ ĭn′tər-năsh′ə-nəl ]

An imaginary line on the Earth's surface that is internationally agreed upon as the place where each new calendar day begins. The line extends from the North to the South Pole through the Pacific Ocean, roughly along the 180th meridian. The calendar day to the east of the line is one day earlier than it is to the west of the line. The International Date Line was established at the International Meridian Conference in 1884 in order to standardize time, especially for the purpose of travel.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.