Webster's Revised Unabridged Dictionary · 1913

Dialogue

Dialogue (?; 115) , noun

[Old English dialogue, Latin dialogus, from Greek {not transcribed}, from {not transcribed} to converse, dia` through + {not transcribed} to speak: compare French dialogue. See Legend.]

1.
A conversation between two or more persons; particularly, a formal conservation in theatrical performances or in scholastic exercises.
2.
A written composition in which two or more persons are represented as conversing or reasoning on some topic; as, the Dialogues of Plato.

Dialogue , intransitive verb

[Compare French dialoguer.]

To take part in a dialogue; to dialogize. [Rare] — Shakespeare

Dialogue , transitive verb

To express as in dialogue. [Rare]
And dialogued for him what he would say. — Shakespeare