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上位互換性 [じょういごかんせい] /(n) (1) (See 下位互換性・1,後方互換性) downward compatibility/backward compatibility/compatibility with input or components intended for lower tier or older systems, versions, etc./(n) (2) (incorrect usage) (See 下位互換性・1) upward compatibility/forward compatibility/compatibility with input or components intended for higher tier or later systems, versions, etc./EntL1352600/