Jisho

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Noun
1. progressive formGrammar
Noun which may take the genitive case particle 'no'
2. in progress; ongoing; underwaySee also 現在進行形
Wikipedia definition
3. Continuous and progressive aspectsThe continuous and progressive aspects (abbreviated CONT and PROG) are grammatical aspects that express incomplete action in progress at a specific time: they are non-habitual, imperfective aspects. It is a verb category with two principal meaning components: (limited) duration and (possible) incompletion. Most languages treat continuous and progressive aspects as alike and use the two terms interchangeably, but there are languages that distinguish them.
Read “Continuous and progressive aspects” on English Wikipedia
Read “進行形” on Japanese Wikipedia
Read “Continuous and progressive aspects” on DBpedia

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