common sense

Common sense (or, when used attributively as an adjective, commonsense, common-sense, or commonsensical), based on a strict construction of the term, is what people in common would agree: that which they "sense" in common as their common natural understanding. Some use the phrase to refer to beliefs or propositions that in their opinion they consider would in most people's experience be prudent and of sound judgment, without dependence upon esoteric knowledge or study or research, but based upon what is believed to be knowledge held by people "in common", so: the knowledge and experience most people have, or are believed to have by the person using the term.
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Common Sense was a pamphlet written by Thomas Paine. It was first published anonymously on January 10, 1776, during the American Revolution. Paine wrote it with editorial feedback from Benjamin Rush, who came up with the title. The document denounced British rule and, through its immense popularity, contributed to fomenting the American Revolution. The second edition was published soon thereafter. A third edition, with an accounting of the worth of the British navy, an expanded appendix, and a response to criticism by the Quakers, was published on February 14, 1776.
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Noun
1. sound practical judgment; "I can't see the sense in doing it now"; "he hasn't got the sense God gave little green apples"; "fortunately she had the good sense to run away"
(synonym) good sense, gumption, horse sense, sense, mother wit
(hypernym) sagacity, sagaciousness, judgment, judgement, discernment
(hyponym) logic

See Common sense, under Sense.
  

"the ability to make logical decisions; horse sense" It is because she has common sense that we ask her opinion.

Synonyms and related words:
admissibility, balance, cool head, coolheadedness, coolness, due sense of, good sense, gumption, horse sense, judgment, justifiability, justness, level head, levelheadedness, logic, logicality, logicalness, plain sense, plausibility, practical mind, practical wisdom, practicality, rationality, reason, reasonability, reasonableness, saneness, sanity, sense, sensibleness, sober-mindedness, soberness, sobriety, sound sense, soundness, sweet reason, wisdom