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first quarter

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noun Astronomy.

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. 2021

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British Dictionary definitions for first quarter

first quarter

noun

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
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
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