IELTS infant Definition A very young child, typically under one year old. Example "The infant smiled at the sound of her mother's voice." Sign in to save IELTS PDF — $25 ← infancy infantile → Study tips featuring "infant" Boost Your IELTS Writing With Precise Vocabulary Related words TOEFL brighten IELTS startle GRE abide SAT abnormal TOEFL aboard TOEFL abolition IELTS upward TOEFL abort IELTS abortion SAT abrupt SAT absence TOEFL absent