Pro and con

from The Collaborative International Dictionary of English v.0.48

Pro \Pro\, adv.
   For, on, or in behalf of, the affirmative side; -- in
   contrast with {con}.
   [1913 Webster]

   {Pro and con}, for and against, on the affirmative and on the
      negative side; as, they debated the question pro and con;
      -- formerly used also as a verb.

   {Pros and cons}, the arguments or reasons on either side.
      [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

PRO AND CON. For and against. For example, affidavits are taken pro and con.

from Moby Thesaurus II by Grady Ward, 1.0

21 Moby Thesaurus words for "pro and con":
      agitate, argue, argumental, argumentative, canvass, combative,
      contentious, controversial, debate, dialectic, discept,
      disputatious, dispute, eristic, ill-humored, litigious, logomachic,
      pilpulistic, polemic, quarrelsome, thrash out

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