倍率【ばいりつ】
magnification, leverage, amplification, scaling factor, scale factor, competitiveness rating (e.g. for university entrance), applicant-to-acceptance ratio
倍増【ばいぞう】
doubling, double
一倍【いちばい】
multiplying by one, original amount, (even) more, double, twice (as much), twofold
倍加【ばいか】
doubling, marked increase, multiplying, redoubling
人一倍【ひといちばい】
(much) more than others, exceedingly, extremely, unusually
倍額【ばいがく】
double amount