1. When used as an adjective referring to a connector, indicates a plug that can only fit one way in a receptacle. Most often refers to a NEMA 1 two prong "Edison" plug with the neutral blade slightly wider than the hot (5/16" vs. 1/4").
See WikiAnswers - If an AC reverses direction 60 Hz then why are there different-sized receptacle slots for hot and neutral since v and i are alternating direction each half cycle for more information.
2. Physics, relating to the distribution of light rays. See Classification of Polarization.
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