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first quarter: Meaning and Definition of

first' quar'ter

Pronunciation: [key]
— Astron. Astron.
  1. the instant, approximately one week after a new moon, when one half of the moon's disk is illuminated by the sun. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
first principle first quartile
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