common sense

• common-sense (when used attributively)

After Latin sensus communis, Ancient Greek κοινὴ αἴσθησις (koinḕ aísthēsis).

common sense (uncountable)

1. Ordinary sensible understanding; one's basic intelligence which allows for plain understanding and without which good decisions or judgments cannot be made.
   • 1776, Horace Walpole, Letter to Sir Horace Mann:

     To act with common sense, according to the moment, is the best wisdom I know; and the best philosophy, to do one's duties, take the world as it comes, submit respectfully to one's lot, bless the goodness that has given us so much happiness with it, whatever it is, and despise affectation.

2. (obsolete) An internal sense, formerly believed to be the sense by which information from the other five senses is understood and interpreted.
   • 1621, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy, Oxford: Printed by Iohn Lichfield and Iames Short, for Henry Cripps, OCLC 216894069; The Anatomy of Melancholy: […], 2nd corrected and augmented edition, Oxford: Printed by John Lichfield and James Short, for Henry Cripps, 1624, OCLC 54573970, (please specify |partition=1, 2, or 3):

     , Book I, New York 2001, p.159:

     This common sense is the judge or moderator of the rest, by whom we discern all differences of objects; for by mine eye I do not know that I see, or by mine ear that I hear, but by my common sense […].

• (ordinary sensible understanding): cop on (Ireland, informal), good sense, mother wit, native wit

• common sense on Wikipedia.Wikipedia