converse

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To engage in a spoken exchange of thoughts, ideas, or feelings; talk. See Synonyms at speak.
2. v. Archaic To be familiar; associate.
3. n. Spoken interchange of thoughts and feelings; conversation.
4. n. Obsolete Social interaction.
5. adj. Reversed, as in position, order, or action; contrary.
6. n. Something that has been reversed; an opposite.
7. n. Logic A proposition obtained by conversion.

Century Dictionary and Cyclopedia

1. To keep company; associate; hold intercourse: followed by with.
2. To talk informally with another; have free intercourse in mutual communication of opinions and sentiments by spoken words; interchange thoughts by speech; engage in discourse: followed by with before the person addressed, and on before the subject.
3. To have sexual commerce. Guardian. Synonyms To speak, discourse, chat.
4. n. Acquaintance by frequent or customary intercourse; familiarity: as, to hold converse with persons of different sects, or to hold converse with terrestrial things.
5. n. Conversation; familiar discourse or talk; free interchange of thoughts or opinions.
6. n. Sexual commerce.
7. Turned about; transposed; reciprocal.
8. n. A part answering or corresponding to another, but differing from it in nature and required to make it complete; a complement; a counterpart: as, the hollows in a mold in which a medal has been cast are the converse of the parts of the medal in relief. [Converse is often used incorrectly in the sense of reverse— that is, the opposite, the contrary.
9. n. In logic: Either of the pair of relations which subsist between two objects, with reference to each other: thus, the relation of child to parent is the converse of the relation of parent to child. One of a pair of propositions having the same subject and predicate or antecedent and consequent, but in the reversed order. Thus, the proposition that every isosceles triangle has two of its angles equal is the converse of the proposition that every triangle having two angles equal is isosceles. See conversion, 2.

Wiktionary

1. adj. Opposite or reverse.
2. n. The opposite or reverse.
3. n. logic Of a proposition or theorem of the form: given that "If A is true, then B is true", then "If B is true, then A is true." equivalently: given that "All Xs are Ys", then "All Ys are Xs".
4. v. formal, intransitive To talk; to engage in conversation.
5. n. ​(now literary) Familiar discourse; free interchange of thoughts or views; conversation; chat.

GNU Webster's 1913

1. v. To keep company; to hold intimate intercourse; to commune; -- followed by with.
2. v. 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.
3. v. To have knowledge of, from long intercourse or study; -- said of things.
4. n. Frequent intercourse; familiar communion; intimate association.
5. n. Familiar discourse; free interchange of thoughts or views; conversation; chat.
6. adj. Turned about; reversed in order or relation; reciprocal.
7. n. (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.
8. n. (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.

WordNet 3.0

1. adj. turned about in order or relation
2. n. a proposition obtained by conversion
3. adj. of words so related that one reverses the relation denoted by the other
4. v. carry on a conversation