Webster's English Dictionary

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pair

1. pair \'pa(*)r, 'pe(*)r\ n or pairs also pair [ME paire, fr. OF, fr. L 
   paria equal things, fr. neut. pl. of pa] pl r equal 1a1: two corresponding 
   things designed for use together {~ of shoes } 1a2: two corresponding 
   bodily parts or members  1b: something made up of two corresponding pieces 
   {~ of trousers}  2a: two similar or associated things : as  2a1: two mated 
   animals  2a2: a couple in love, engaged, or married  2a3: two playing cards 
   of the same value or denomination  2a4: two horses harnessed side by side  
   2a5: two members of a deliberative body that agree not to vote on a specifi 
   c issue during a time agreed on 2b: a partnership esp. of two players in a 
   contest against another partners hip 2c: an agreement not to vote made by 
   the two members of a pair (sense 2a(5) ) chiefly dial  3: a set or series 
   of small objects (as beads) 
2. pair vt 1a: to make a pair of  1b: to arrange a voting pair between  2: 
   to arrange in pairs {~ed her guests}  1: to constitute a member of a pair  
   2a: to become associated with another  2b: to become grouped or separated 
   into pairs {~ed off for t he next dance}