中ちゅう石せっ器き時じ代だいMeaningsNoun1. Mesolithic; Middle Stone AgeKanji used中in石stone器instrument時time代substitutePitch accentちゅうせっきじだいComposed of中ちゅうmedium (size); average (grade, level, etc.); middle; in; within; out of (e.g. ten people); among; during; while; in (the course of); …Noun石せっ器き時じ代だいStone AgeNoun