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1352600 jmdict A [id=2001303] 上位互換性 じょういごかんせい [1][n] downward compatibility; backward compatibility; [expl] compatibility with input or components intended for lower tier or older systems, versions, etc. [see=1184490・下位互換性[1]] [see=2838749・後方互換性[1]] [2][n] [note="incorrect usage"] upward compatibility; forward compatibility; [expl] compatibility with input or components intended for higher tier or later systems, versions, etc. [see=1184490・下位互換性[1]]