上位互換性 じょういごかんせい downward compatibility; backward compatibility; compatibility with input or components intended for lower tier or older systems, versions, etc. n upward compatibility; forward compatibility; compatibility with input or components intended for higher tier or later systems, versions, etc. n Advanced ➥
お互い様 おたがいさま we are of equal status in this regard; we are in the same boat adj-na n the same to you; the feeling is mutual exp Advanced ➥
互選 ごせん election by mutual vote; election from within a committee (party, etc.); internal vote n vs Advanced ➥