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noun Also sky line.
  1. the boundary line between earth and sky; the apparent horizon: A sail appeared against the skyline.
  2. the outline of something, as the buildings of a city, against the sky: the New York skyline.
verb (used with object), sky·lined, sky·lin·ing.
  1. to outline (something) against the sky.

Origin of skyline

First recorded in 1855–60; sky + line1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for skyline


  1. the line at which the earth and sky appear to meet; horizon
  2. the outline of buildings, mountains, trees, etc, seen against the sky
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

Word Origin and History for skyline


"horizon," 1824, from sky (n.) + line (n.).

Online Etymology Dictionary, © 2010 Douglas Harper