the youngest member of a family, group, etc.: I was the baby of the family for ten years, until my twin brothers were born.
an adult who behaves like a child; an immature, helpless, or fearful person: Just swallow the medicine—don't be such a baby!
a human fetus: The baby hasn’t arrived yet, but the nursery is ready.
Informal.
Sometimes Disparaging and Offensive.a girl or woman, especially an attractive one.
a person of whom one is deeply fond; sweetheart.
(sometimes initial capital letter)an affectionate or familiar address (sometimes offensive when used to strangers, casual acquaintances, subordinates, etc., especially by a male to a female).
a man or boy; fellow: He's a tough baby to have to deal with.
an invention, creation, project, or the like that requires one's special attention or expertise or of which one is especially proud: His charitable foundation is his baby and it truly shows.
an object; thing: Those big babies can carry a lot of cargo.
adjective
of or suitable for a baby: baby clothes.
of or like a baby; infantile: baby skin.
treating babies: a baby doctor.
small; comparatively little: baby eggplants.
verb (used with object),ba·bied,ba·by·ing.
to treat like a young child; pamper: She still babies her son although he's nearly 24.
to handle or use with special care; treat gently.
Origin of baby
First recorded in 1350–1400; Middle English; see origin at babe, -y2