common good〉 b : known to the community 〈common nuisances〉 2 a : belonging to or shared by two or more individuals or things or by all members of a group 〈a common friend〉 〈buried in a common grave〉 b : belonging equally to two or more mathematical entities 〈triangles with a common base〉 c : having two or more branches 〈common carotid artery〉 3 a : occurring or appearing frequently : FAMILIAR 〈a common sight〉 b : of the best known kind c : VERNACULAR 2 〈common names〉 4 a : WIDESPREAD, GENERAL 〈common