下位 かい互換 ごかん
kaigokan

Noun
no-Adjective

1. upward compatible; forward compatible; compatible with input or components intended for higher tier or later systems, versions, etc. — explanation

Noun
no-Adjective

2. downward compatible; backward compatible; compatible with input or components intended for lower tier or older systems, versions, etc. — explanation

Noun
no-Adjective

3. providing the same function while being less effective (esp. in games)

Slang