percentage point

A measure of the change of a part in terms of the whole. As an example, let us take an interest rate of 4 pence on the pound, i.e. 4%. If this is increased to 6 pence, it would have increased by 50% relative to itself, but, being from 4% to 6% relative to the capital figure against which the interest rate is expressed, increased by two percentage points. See basis point for a related expression.