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Wikipedia definition
1. Arrow of timeThis article is an overview of the subject. For a more technical discussion and for information related to current research, see Entropy (arrow of time). The arrow of time, or time’s arrow, is a term coined in 1927 by the British astronomer Arthur Eddington to describe the "one-way direction" or "asymmetry" of time.
Read “Arrow of time” on English Wikipedia
Read “時間の矢” on Japanese Wikipedia
Read “Arrow of time” on DBpedia

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