flat rateTranslate flat rate | into French | into German | into Italian Definition of flat rate noun a charge or level of payment that is the same in all cases:clients are charged a flat rate of £250 annually [as modifier]:the flat-rate state pension a rate of taxation that is not progressive, but remains at the same proportion on all amounts: a tax levied at a flat rate of 7.65 per centflat rate in other Oxford dictionaries Definition of flat rate in the US English dictionary
