Definition of Gibbous
When someone says the moon is gibbous, it means that more than 50% of the moon is illuminated in the sky. This happens when the moon is moving towards a full moon and after the full moon when we are approaching a new moon.
TERM OF THE DAY
When the entire face of the moon is visible from Earth, opposite the sun and unobstructed from Earth's shadow, it is considered a full moon. A full moon occurs approximately every 29 days.Read the full Full Moon definition