sitter Get Printable Handwriting (sit-ter) 2 syllables Learn It! Spelling Test Definition noun. a person who sits; a person who stays with young children while the parents go out; babysitter; a brooding hen. Example Sentence Tina is my sitter when my parents have to go out. Synonyms baby-sitter; brood hen; caretaker Antonyms stander Share with your friends: