(telecommunications) A telecommunications switching system, physically located at a customer's place of business, that provides internal communication between users and also access to outside (trunk) telephone lines.

(Britain) The government department that collects and manages revenue.

A treasury. / An available fund of money, especially one for a specific purpose.

(transitive) To proceed against (a person) in the Court of Exchequer.

simple past tense and past participle of except

(mathematics, physics) A space in which a generalization of quantum mechanics is described in terms of a system with a finite number of degrees of freedom

The exchange of currency from one country for currency from another country. / Foreign currency.

resembling an exclamation. / Emphatic.

The quality of being excellent.

Easily excited / (physics) Able to be promoted to an excited state