下位互換性かいごかんせい

1. 1upward compatibility ; forward compatibility ; compatibility with input or components intended for higher tier or later systems, versions, etc. Translated by Jiyomi
2. 2downward compatibility ; backward compatibility ; compatibility with input or components intended for lower tier or older systems, versions, etc. Translated by Jiyomi

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JMdict entry 1184490. Source and licence.