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common

adjective (USUAL)
 
 
/ˈkɒm.ən/ US  /ˈkɑː.mən/

Definition

B1 the same in a lot of places or for a lot of people: It's quite common to see couples who dress alike. The surname 'Smith' is very common in Britain.Plain and ordinaryTedious and uninspiring common courtesy/decency the basic level of politeness that you expect from someonePlain and ordinaryTedious and uninspiring common knowledge B2 a fact that everyone knows: [+ that] It's common knowledge that they live together.Plain and ordinaryTedious and uninspiringKnowledge and awareness
(Definition of common adjective (USUAL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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