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first quarter

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noun Astronomy.
  1. the instant, approximately one week after a new moon, when one half of the moon's disk is illuminated by the sun.
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Origin of first quarter

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for first quarter

Contemporary Examples

Historical Examples

  • A first-quarter moon shed its cold, silvery light on the drama at the base of the precipitous rock.


British Dictionary definitions for first quarter

first quarter

noun
  1. one of the four principal phases of the moon, occurring between new moon and full moon, when half of the lighted surface is visible from earthCompare last quarter
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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