上位互換性 #word — Semantide dictionary

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Noun
downward compatibility; backward compatibility; compatibility with input or components intended for lower tier or older systems, versions, etc.
see 下位互換性see 後方互換性
旧システム用に書かれたソフトとの上位互換性を保つのは大切です。
It is important to maintain backward compatibility with software that was written to run on the former system.
upward compatibility; forward compatibility; compatibility with input or components intended for higher tier or later systems, versions, etc.
incorrect usagesee 下位互換性