preexchange

Adjective

 * 1) Occurring before an exchange.

Noun

 * 1) An exchange that takes place beforehand.
 * 2) An interaction that introduces and leads to but is not yet a true exchange.
 * 1) An interaction that introduces and leads to but is not yet a true exchange.
 * 1) An interaction that introduces and leads to but is not yet a true exchange.
 * 1) An interaction that introduces and leads to but is not yet a true exchange.
 * 1) An interaction that introduces and leads to but is not yet a true exchange.

Verb

 * 1) To exchange beforehand.