ALL meanings of first quarter
first quar·ter
F f - noun first quarter the instant, approximately one week after a new moon, when one half of the moon's disk is illuminated by the sun. 1
- noun first quarter 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 0
- noun first quarter the time of month between new moon and first half-moon 0
- noun first quarter the phase of the moon after the waxing crescent when only the right half of its face, when viewed from the Northern Hemisphere, reflects sunlight to the earth 0