last quarter moon Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. The phase of the moon where half of it is illuminated and visible from Earth, occurring a week after a full moon. Example Sentence The sky was beautifully lit by the last quarter moon. Synonyms third quarter moon; half moon; waning half moon Antonyms new moon; full moon Hear It! Say It! Write It! last quarter moon Switch to cursive Start Share with your friends: