common
Pronunciation: /ˈkɒmən/
adjective ( commoner, commonest)
- 1occurring, found, or done often; prevalent: salt and pepper are the two most common seasonings it’s common for a woman to be depressed after giving birth
- (of an animal or plant) found or living in relatively large numbers; not rare: you might spot less common birds such as the great spotted woodpecker the swordfish is not common in European waters
- denoting the most widespread or typical species of an animal or plant: the common gull
- ordinary; of ordinary qualities; without special rank or position: the dwellings of common people a common soldier
- (of a quality) of a sort or level to be generally expected: common decency
- of the most familiar type: the common or vernacular name
- 2shared by, coming from, or done by two or more people, groups, or things: the two republics' common border problems common to both communities
- belonging to or involving the whole of a community or the public at large: common land
- Mathematics belonging to two or more quantities.
- 3British showing a lack of taste and refinement supposedly typical of the lower classes; vulgar: she’s so common
noun

Phrases
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common currency
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common form
- what is usually done; accepted procedure: it is nowadays common form to acknowledge Pound’s generosity to other writers
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the common good
- the benefit or interests of all: it is time our elected officials stood up for the common good
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common ground
- opinions or interests shared by each of two or more parties: artists from different cultural backgrounds found common ground
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common knowledge
- something known by most people: it’s common knowledge that no one has yet found a cure for cancer
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common or garden
- British informal of the usual or ordinary type: a common or garden family saloon car
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common property
- a thing or things held jointly: the atmosphere is the common property of every nation on earth
- something known by most people: the general theory of climate change has now become common property
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common thread
- a theme or characteristic found in various stories or situations: a common thread through most of the stories is the support from the family
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the common touch
- the ability to get on with or appeal to ordinary people: he was an intimate of Lord Beaverbrook yet kept the common touch
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have something in common
- have a specified amount or degree of shared interests or characteristics: they had one thing in common, an obsession with rock and roll
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in common
- in joint use or possession; shared: a sect that had wives in common
- Law held or owned by two or more people each having undivided possession but with distinct, separately transferable interests.
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in common with
- in the same way as: in common with other officers I had to undertake guard duties
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out of the common
- British rarely occurring; unusual: it is odd, yes, but not so out of the common

Origin:
Middle English: from Old French comun (adjective), from Latin communis