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 quantum physics it is most likely to refer to Alain Aspect, the French physicist of Bell test experiment fame.