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virus
[from the obvious analogy with biological viruses, via SF]
n. A cracker program that searches out other programs and `infects'
them by embedding a... VIEW ENTIRE DEFINITION
View Definition: orthogonal

orthogonal [from mathematics] adj. Mutually independent; well
separated; sometimes, irrelevant to. Used in a generalization of
its mathematical meaning to describe sets of primitives or
capabilities that, like a vector basis in geometry, span the
entire `capability space' of the system and are in some sense
non-overlapping or mutually independent. For example, in
architectures such as the PDP-11 or VAX where all or nearly all
registers can be used interchangeably in any role with respect to
any instruction, the register set is said to be orthogonal. Or, in
logic, the set of operators `not' and `or' is orthogonal,
but the set `nand', `or', and `not' is not (because any
one of these can be expressed in terms of the others). Also used
in comments on human discourse "This may be orthogonal to the
discussion, but...."