下位互換 [かいごかん] /(adj-no,n) (1) (See 上位互換・じょういごかん・1,前方互換) upward compatible/forward compatible/compatible with input or components intended for higher tier or later systems, versions, etc./(adj-no,n) (2) (incorrect usage) (See 上位互換・じょういごかん・1) downward compatible/backward compatible/compatible with input or components intended for lower tier or older systems, versions, etc./(adj-no,n) (3) (sl) providing the same function while being less effective (esp. in games)/EntL2838742/