[1] : WordNet (r) 2.0

opposite number
     n : a person or thing having the same function or
         characteristics as another syn: counterpart, vis-a-vis
see also:
counterpart vis-a-vis 

[2] : Moby Thesaurus II by Grady Ward, 1.0

43 moby thesaurus words for "opposite number":
   antipode, antipodes, antipole, antithesis, antonym, coequal,
   compeer, complement, contra, converse, coordinate, counter,
   counterbalance, countercheck, counterpart, counterpoint,
   counterpoise, counterpole, counterterm, cousin, ditto, equal,
   equipollent, equivalent, fellow, foil, inverse, like, match, mate,
   obverse, offset, opposite, parallel, peer, reverse, rival, setoff,
   tally, the contrary, the other side, twin, vis-a-vis

Opposite Number >> O Words
Opposite Number, definition of term: Opposite Number
opposite+number_pag1.html

Number >> N Words
Number, definition of term: Number
number_pag1.html

Opposite >> O Words
Opposite, definition of term: Opposite
opposite_pag1.html

Number Sign >> N Words
Number Sign, definition of term: Number Sign
number+sign_pag1.html

Number Cruncher >> N Words
Number Cruncher, definition of term: Number Cruncher
number+cruncher_pag1.html

Natural Number >> N Words
Natural Number, definition of term: Natural Number
natural+number_pag1.html

Phone Number >> P Words
Phone Number, definition of term: Phone Number
phone+number_pag1.html

Octane Number >> O Words
Octane Number, definition of term: Octane Number
octane+number_pag1.html

Perfect Number >> P Words
Perfect Number, definition of term: Perfect Number
perfect+number_pag1.html

Mixed Number >> M Words
Mixed Number, definition of term: Mixed Number
mixed+number_pag1.html

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