English definition of “reasonable”
FAIR › fair and showing good judgment: [+ to do sth] It's not reasonable to expect people to work those hours. → Opposite unreasonable
BIG ENOUGH › big enough or large enough in number, although not big or not many: There were a reasonable number of people there. It's a reasonable amount of cash.
GOOD ENOUGH › good enough but not the best: I'd say her work is of a reasonable standard.
CHEAP › not expensive: reasonable prices