fam·i·ly
[fam-uh-lee, fam-lee]

noun
1. a. a basic social unit consisting of parents and their children, considered as a group, whether dwelling together or not: the traditional family.
    b. a social unit consisting of one or more adults together with the children they care for: a single-parent family.

2. the children of one person or one couple collectively: We want a large family.

3. the spouse and children of one person: We’re taking the family on vacation next week.

4. any group of persons closely related by blood, as parents, children, uncles, aunts, and cousins: to marry into a socially prominent family.

5. all those persons considered as descendants of a common progenitor.

6. Chiefly British . approved lineage, especially noble, titled, famous, or wealthy ancestry: young men of family.

7. a group of persons who form a household under one head, including parents, children, and servants.

8. the staff, or body of assistants, of an official: the office family.

9. a group of related things or people: the family of romantic poets; the halogen family of elements.

10. a group of people who are generally not blood relations but who share common attitudes, interests, or goals and, frequently, live together: Many hippie communes of the sixties regarded themselves as families.

11. a group of products or product models made by the same manufacturer or producer.

12. Biology . the usual major subdivision of an order or suborder in the classification of plants, animals, fungi, etc., usually consisting of several genera.

13. Slang . a unit of the Mafia or Cosa Nostra operating in one area under a local leader.

14. Linguistics . the largest category into which languages related by common origin can be classified with certainty: Indo-European, Sino-Tibetan, and Austronesian are the most widely spoken families of languages. Compare stock ( def. 12 ) , subfamily ( def. 2 ) .

15. Mathematics .
     a. a given class of solutions of the same basic equation, differing from one another only by the different values assigned to the constants in the equation.
     b. a class of functions or the like defined by an expression containing a parameter.
     c. a set.

adjective
16. of, pertaining to, or characteristic of a family: a family trait.

17. belonging to or used by a family: a family automobile; a family room.

18. suitable or appropriate for adults and children: a family amusement park.

19. not containing obscene language: a family newspaper.

Idiom
20. in a / the family way, pregnant.