Baby  —n. (pl. -ies) 1 very young child. 2 childish person. 3 youngest member of a family etc. 4 (often attrib.) A very young animal. B small specimen. 5 slang sweetheart. 6 one's special concern etc. —v. (-ies, -ied) treat like a baby; pamper.  babyhood n. Babyish adj. [imitative of child's ba ba]