(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.

plural of private branch exchange

plural of public-private partnership

plural of private-use character

(typography) A character whose use is defined by private users and companies rather than defined by a standard such as Unicode, and which therefore has no universally accepted meaning.

(philosophy) The problem, considered by Ludwig Wittgenstein (1889-1951) and other philosophers, of whether it is possible for a private language to exist.

(philosophy) The argument, famously made by Ludwig Wittgenstein (1889-1951), that a private language cannot exist.

(philosophy) The thesis or contention that a private language cannot exist.

plural of private enterprise number

The law of a state that decides the law of which state is applied to legal relationships in civil and commercial matters that contain foreign elements.