One of a pair of terms that name or describe a relationship from opposite perspectives; converse antonym; relational antonym.
Free verbal interchange of thoughts or views; conversation; chat.
The opposite or reverse.
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.".
To keep company; to hold intimate intercourse; to commune.
To talk; to engage in conversation.
opposite; reversed in order or relation; reciprocal
A personal relationship between two people.
Matching each member of one set with exactly one member of another set.
Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.
Involving direct communication between two people.