(object identifier) A value specifying the nature of an X.400 object. MAPI uses OIDs for various purposes, such as indicating the types of attached files. "Object" is a much more generalized concept in X.400 than in object-oriented programming. It can mean an algorithm, application, body part type, character set, external parameter, or message type, among other things. Also, it usually refers to a class of things, such as CRC-32, rather than one particular implementation of a 32-bit CRC (cyclic redundancy code).
one-off
British jargon for something that is used only once and not retained permanently. Also referred to as one-shot.