Aspect

Aspect can mean one of the following things:

In computer programming, an aspect is a feature that is linked to many parts of a program, but which is not necessarily the primary function of the program.
In linguistics, aspect is a grammatical feature having to do with the internal temporal flow of an event.
In railway signalling, the aspect is the number of lights on the signal and their state (EG. red, red, off, semaphore at horizontal, etc), EG. the standard 3 light traffic signal is a three-aspect signal.
In astrology, aspect is the relative angle between two heavenly bodies.
In remote sensing, as above, aspect is also the relative angular subtense of a remote object.
In quantum physics it is most likely to refer to Alain Aspect, the French physicist of Bell test experiment fame.

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