Lengua inglesa
1 often met with; frequent; familiar a common mistake .
2 shared by two or more people, things, etc characteristics common to both animals .
3 publicly owned.
4 said of a standard one has a right to expect common decency .
5 widespread common knowledge .
6 derog lacking taste or refinement; vulgar.
7 a of the ordinary type the common cold ;
b especially of plants and animals: general or ordinary common toad common bindweed .
8 not of high rank or class the common people .
9 maths shared by two or more numbers highest common factor .
1 a piece of land that is publicly owned or available for public use.
2 law a right to something, or to do something, on someone else's land.
3 slang common sense. See also commons.
[13c: in the form commun , from French comun , from Latin communis ]
commonly adverb .
commonness noun .
in common
1 said of two people with regard to their interests, etc: shared.
2 in joint use or ownership a garden owned in common by the residents .
make common cause to co-operate to achieve a common aim.
the common touch the ability, in someone distinguished by accomplishment or rank, to relate sociably to ordinary people.

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common denominator
1 maths a whole number that is a multiple of each of the denominators of two or more vulgar fractions. See also lowest common denominator.
2 something that enables comparison, agreement, etc between people or things.

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Common Era
noun (abbreviation CE) a culturally neutral term for the era reckoned since the birth of Christ, sometimes used instead of Anno Domini. See also BCE.

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common fraction see under vulgar fraction

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common ground
noun an area of mutual agreement or shared interest, often used as a starting-point for discussion.

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