certainty noun

ADJ. absolute, complete | reasonable, virtual It's a virtual certainty that petrol will go up in price.

QUANT. degree It's difficult to predict with any degree of certainty how much it will cost.

PREP. with ~ I couldn't say with absolute certainty that he's here.

PHRASES a lack of certainty There seems to be a lack of certainty over what we should do. | the one/only certainty The one certainty left in a changing world is death.