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