Grade 5 infant Get Printable Handwriting (in-fant) 2 syllables Rhymes Learn It! Spelling Test Definition noun. a very young child birth to 1 year who has not yet begun to walk or talk; Example Sentence Tonight I am going to babysit my infant brother. Synonyms baby; babe; small child Antonyms grown-up Rhymes Two Syllable Rhymes (1) infant Share with your friends: