last quarter moon Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a phase of the moon when half of it is visible. Example Sentence The sky was beautifully lit by the last quarter moon. More Example Sentences Many stars appeared near the last quarter moon. Synonyms third quarter 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: