from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A family unit consisting of a mother and father and their children.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a family unit consisting of at most a father, mother and dependent children
from the GNU version of the Collaborative International Dictionary of English
- n. A family consisting of parents and their children and grandparents of a marital partner.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a family consisting of parents and their children and grandparents of a marital partner
From nuclear, basic, cardinal, central.(American Heritage® Dictionary of the English Language, Fourth Edition)