converse

The opposite or reverse.

Of a proposition or theorem consisting of a statement of the form "If A is true, then B is true", the statement "If B is true, then A is true" which need not be equivalent to the first one.

Synonym of transpose.

One of a pair of terms that name or describe a relationship from opposite perspectives; converse antonym; relational antonym.

Opposite; reversed in order or relation; reciprocal.

(formal) To talk; to engage in conversation.

To keep company; to hold intimate intercourse; to commune.

(no longer used) To have knowledge of something, from long talk or study.

(literary) Free verbal interchange of thoughts or views; conversation; chat.