げんそく 減速 Common word LinksSentence search for 減速Sentence search for げんそくKanji details for 減 and 速Edit in JMdict Noun, Suru verb, Transitive verb, Intransitive verb, Noun which may take the genitive case particle 'no'1. decelerationAntonym: 加速 Discussions Log in to talk about this word.