first quarter


nounAstronomy.
  1. the instant, approximately one week after a new moon, when one half of the moon's disk is illuminated by the sun.

Origin of first quarter

1
First recorded in 1905–10

Words Nearby first quarter

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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 earth: Compare last quarter

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