Jisho

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じょうかんせい 上位互換性
Noun
1. downward compatibility; backward compatibility; compatibility with input or components intended for lower tier or older systems, versions, etc.See also 下位互換性, See also 後方互換性
Noun
2. upward compatibility; forward compatibility; compatibility with input or components intended for higher tier or later systems, versions, etc.See also 下位互換性, incorrect usage

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