実在じつざい Common Noun Irregular Intransitive Noun English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verbnouns which may take the genitive case particle 'no' actual existence;real existence;existing in real life サンタクロースが実在しないなんて信じない。 I don't believe that Santa Claus is imaginary.