1. [n]  a proposition obtained by conversion
2. [adj]  turned about in order or relation; "transposed letters"
3. [adj]  of words so related that one reverses the relation denoted by the other; "`parental' and `filial' are converse terms"
4. [v]  carry on a conversation

1. \Con*verse"\ (k[o^]n*v[~e]rs"), v. i. [imp. & p. p.
   {Conversed}; p. pr. & vb. n. {Conversing}.] [F. converser, L.
   conversari to associate with; con- + versari to be turned, to
   live, remain, fr. versare to turn often, v. intens. of
   vertere to turn See {Convert}.]
   1. To keep company; to hold intimate intercourse; to commune;
      -- followed by with.
            To seek the distant hills, and there converse With
            nature.                               --Thomson.
            Conversing with the world, we use the world's
            fashions.                             --Sir W.
                                                  Scott.
            But to converse with heaven - This is not easy.
                                                  --Wordsworth.
   2. To engage in familiar colloquy; to interchange thoughts
      and opinions in a free, informal manner; to chat; --
      followed by with before a person; by on, about,
      concerning, etc., before a thing.
            Companions That do converse and waste the time
            together.                             --Shak.
            We had conversed so often on that subject. --Dryden.
   3. To have knowledge of, from long intercourse or study; --
      said of things.
            According as the objects they converse with afford
            greater or less variety.              --Locke.
   Syn: To associate; commune; discourse; talk; chat.
   

2. \Con"verse\, n.
   1. Frequent intercourse; familiar communion; intimate
      association. --Glanvill.
            ``T is but to hold Converse with Nature's charms,
            and view her stores unrolled.         --Byron.
   2. Familiar discourse; free interchange of thoughts or views;
      conversation; chat.
            Formed by thy converse happily to steer From grave
            to gay, from lively to severe.        --Pope.
   

3. \Con"verse\, a. [L. conversus, p. p. of convertere. See
   {Convert}.]
   Turned about; reversed in order or relation; reciprocal; as,
   a converse proposition.
   

4. \Con"verse\, n.
   1. (Logic) A proposition which arises from interchanging the
      terms of another, as by putting the predicate for the
      subject, and the subject for the predicate; as, no virtue
      is vice, no vice is virtue.
   Note: It should not (as is often done) be confounded with the
         contrary or opposite of a proposition, which is formed
         by introducing the negative not or no.
   2. (Math.) A proposition in which, after a conclusion from
      something supposed has been drawn, the order is inverted,
      making the conclusion the supposition or premises, what
      was first supposed becoming now the conclusion or
      inference. Thus, if two sides of a sides of a triangle are
      equal, the angles opposite the sides are equal; and the
      converse is true, i.e., if these angles are equal, the two
      sides are equal.
   

The truth of a proposition of the form A => B and its converse B => A are shown in the following truth table:

        A   B | A => B   B => A
        ------+----------------
        f   f |          t           t
        f   t |          t           f
        t   f |          f           t
        t   t |          t           t