first quarter moon Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. the phase of the moon when it appears half lit and half dark, because it is at a right angle to the Sun. Example Sentence The first quarter moon shone brightly in the night sky. Synonyms half moon; first quarter phase; waxing half moon Antonyms full moon; new moon Hear It! Say It! Write It! first quarter moon Switch to cursive Start Share with your friends:
