B2[ U ]
the quality of being true:
truth in There would seem to be some truth in what she says.
There is no truth in the reports of his resignation.
truth of You cannot question the truth of his alibi.
a grain of truth And yet what he says contains at least a grain of (= a small amount of) truth.
C2[ C ]
a fact or principle that is thought to be true by most people:
It would seem to be a general truth that nothing is as straightforward as it at first seems.
The entire system of belief is based on a few simple truths.