(p. pr. & vb. n.) of Lengthen.

continualness continuance continuation continuity crescendoing crescent elongation endurance expanding extension growing increasing incremental intensifying lingering maintenance multiplying on the increase perpetuation perseverance persistence procrastination production progress progression proliferating prolongation protraction pursuance repetition run snowballing spreading staying power straight course strain stretch stretching stringing out sustained action sustenance swelling tension tightening uninterrupted course unremittingness waxing way