noun, noun which may take the genitive case particle 'no'
five times; quintuple; fivefold
Used to express a quantity or degree that is five times as much as a reference. Can function as a noun or modify another noun with の.
今年の売上は去年の五倍になった。
This year's sales became five times last year's.
五倍の量の水を加えてください。
Please add five times the amount of water.
倍 is the general counter for 'times' or '-fold'. 五倍 specifically means 'five times'.
二倍 means 'double' or 'two times', while 五倍 means 'five times'.
Compound of 五 (five) and 倍 (times, -fold).