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Wikipedia definition
1. Imaginary time​Imaginary time is a concept derived from quantum mechanics and is essential in connecting quantum mechanics with statistical mechanics. Imaginary time can be difficult to visualize. If we imagine "regular time" as a horizontal line running between "past" in one direction and "future" in the other, then imaginary time would run perpendicular to this line as the imaginary numbers run perpendicular to the real numbers in the complex plane.
Read “Imaginary time” on English Wikipedia
Read “虚時間” on Japanese Wikipedia
Read “Imaginary time” on DBpedia

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