Definition:-

• Used to indicate that a named person is also known or more familiar under another specified name. (adverb)
• A false or assumed identity. (noun)
• Each of a set of signal frequencies which, when sampled at a given uniform rate, would give the same set of sampled values, and thus might be incorrectly substituted for one another when reconstructing the original signal. (noun)
• Misidentify (a signal frequency), introducing distortion or error. (verb)