下か位い互ご換かん

noun which may take the genitive case particle 'no', noun

upward compatible; forward compatible

Technical term for compatibility with higher-tier or newer systems. Often used in IT contexts.

See also: 上位互換 (じょういごかん) · 前方互換

• このソフトは下か位い互ご換かんがあるので、新あたらしいバージョンのファイルも開あけます。

  This software is upward compatible, so it can open files from newer versions as well.

noun which may take the genitive case particle 'no', noun

downward compatible; backward compatible

Incorrect but common usage; the correct term is 上位互換 (じょういごかん). Often used by non-experts.

See also: 上位互換 (じょういごかん)

• このプリンターは古ふるいパソコンでも使つかえるので下か位い互ご換かんがあると言いわれるが、正ただしくは上じょう位い互ご換かんです。

  This printer works with old computers, so it's often said to be downward compatible, but the correct term is upward compatible.

noun which may take the genitive case particle 'no', noun

inferior version; less effective equivalent

Slang, especially in gaming communities, for something that performs the same role but worse than another option.

• このキャラはあのキャラの下か位い互ご換かんだから、わざわざ使つかう必ひつ要ようはない。

  This character is an inferior version of that one, so there's no need to use it on purpose.