English
gainable
From gain + -able.
Formed from gain + -able
Proto-Indo-European *ḱóm ‘next to’
…
Proto-Germanic *gagana ‘back’
Proto-Germanic *gagną
Old Norse gagn ‘benefit’
Middle English gayn ‘profit’
English gain
Today it means
adj Capable of being gained (in any sense), obtained, or reached.
Language periods are conventional ranges, not dates for this word.
Etymograph / gainable