後こう方ほう互ご換かん性せいMeaningsNoun1. backward compatibility; downward compatibilityKanji used後after方way互mutual換exchange性nature (of a person)Composed of後こう方ほうrear; back; behindNoun互ご換かんinterchange; transposition; compatible (e.g. PC)Noun性せいnature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); -ty; -ity; -ness; -cyNoun