common sense

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Sound judgment not based on specialized knowledge.

from The Century Dictionary.

• Characterized by common or good sense: as, he took a common-sense view of the question. See common sense, under common, a.

from the GNU version of the Collaborative International Dictionary of English.

• See Common sense, under sense.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete An internal sense, formerly believed to be the sense by which information from the other five senses is understood and interpreted.
• noun Ordinary sensible understanding; one's basic intelligence which allows for plain understanding and without which good decisions or judgments cannot be made.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun sound practical judgment
• adjective exhibiting native good judgment