baby

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A very young child; an infant.
2. n. An unborn child; a fetus.
3. n. The youngest member of a family or group.
4. n. A very young animal.
5. n. An adult or young person who behaves in an infantile way.
6. n. Slang A girl or young woman.
7. n. Informal Sweetheart; dear. Used as a term of endearment.
8. n. Slang An object of personal concern or interest: Keeping the boat in good repair is your baby.
9. adj. Of or having to do with a baby.
10. adj. Infantile or childish.
11. adj. Small in comparison with others of the same kind: baby vegetables.
12. v. To pamper like a baby; coddle. See Synonyms at pamper.

Century Dictionary and Cyclopedia

1. n. An infant or young child of either sex; a babe.
2. n. A doll.
3. n. [Cf. E. pupil, ⟨ L. pupilla, a girl, the pupil of the eye.] The minute reflection which a person sees of himself in the pupil of another's eye. There are many allusions to this in our older poets; hence such phrases as to look babies in one's eyes, used with regard to a lover.
4. n. One who is like a baby; a childish person.
5. n. To attempt to excuse excessive or feigned ignorance or stupidity on the ground of professed inexperience. [Colloquial in both uses.]
6. Babyish; infantine; pertaining to an infant.
7. Small, or comparatively small: as, a baby engine.
8. To treat like a young child.

Wiktionary

1. n. A very young human, particularly from birth to a couple of years old or until walking is fully mastered.
2. n. Any very young animal, especially a vertebrate; many species have specific names for their babies, such as kittens for the babies of cats, puppies for the babies of dogs, and chicks for the babies of birds. See Category:Baby animals for more.
3. n. A person who is immature or infantile.
4. n. A term of endearment for a girlfriend or boyfriend or spouse.
5. n. informal A form of address to a man or a woman considered to be attractive.
6. n. A pet project or responsibility.
7. n. The lastborn of a family; a benjamin.
8. n. An affectionate term for anything.
9. adj. Of a child: very young; of the age when he or she would be termed a baby or infant.
10. adj. Of an animal: young.
11. adj. Intended for babies.
12. adj. etc. Picked when small and immature (as in baby corn, baby potatoes).
13. v. To coddle.

GNU Webster's 1913

1. n. An infant or young child of either sex; a babe.
2. n. A small image of an infant; a doll.
3. adj. Pertaining to, or resembling, an infant; young or little.
4. v. To treat like a young child; to keep dependent; to humor; to fondle.

WordNet 3.0

1. n. (slang) sometimes used as a term of address for attractive young women
2. n. a project of personal concern to someone
3. n. a very young mammal
4. n. an unborn child; a human fetus
5. n. an immature childish person
6. n. the youngest member of a group (not necessarily young)
7. v. treat with excessive indulgence
8. n. a very young child (birth to 1 year) who has not yet begun to walk or talk