common courtesy

:  of or relating to a community at large :  public

:  known to the community

:  belonging to or shared by two or more individuals or things or by all members of a group

:  the common people

:  a dining hall

:  the political group or estate comprising the commoners

:  behavior marked by polished manners or respect for others :  courteous behavior

:  a courteous and respectful act or expression

:  general allowance despite facts :  indulgence

:  granted, provided, or performed as a courtesy or by way of courtesy (see ¹courtesy)