pair (nom)
Sens 1 : a set of two separate things that are identical or similar
or that happen to be closely associated without necessarily being identical or similar
or that in some other way occur together or are brought together or are used together
or are viewed as together forming a closely associated couple [source : MWU]
--------------------------------------------------
--------------------------------------------------
Sens 1 : to put people or things into groups of two, or to form groups of two. [source : LG]