Jisho

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Noun, Suru verb, Intransitive verb, Noun which may take the genitive case particle 'no'
1. going side-by-side; going abreast
Noun, Suru verb, Intransitive verb, Noun which may take the genitive case particle 'no'
2. running concurrently; occurring at the same time; keeping pace with
Wikipedia definition
3. Parallel (geometry)Parallelism is a term in geometry that refers to a property in Euclidean space of two or more lines or planes, or a combination of these. The assumed existence and properties of parallel lines are the basis of Euclid's parallel postulate. Two lines in a plane that do not intersect or touch at a point are called parallel lines. Likewise, a line and a plane, or two planes, in three-dimensional Euclidean space that do not share a point are said to be parallel.
Read “Parallel (geometry)” on English Wikipedia
Read “平行” on Japanese Wikipedia
Read “Parallel (geometry)” on DBpedia
Other forms
併行 【へいこう】

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