confirm
v. to make certain, given support
to give support or certainty to (a fact, belief, statement, etc.), e.g. by providing more proof or by stating that something is true or correct:
adj. confirmed
n. confirmation
Syn. prove
The director confirmed that the meeting would be on the tenth.
We have just received confirmation of your reservation on the flight to Los Angeles.
He said he would accept the job, so we have asked him to confirm his acceptance in writing.
The expression on her face confirmed our worst fears.
This new evidence confirms (me in) my opinion that they are lying.
The President refused to either confirm or deny this rumor.
The announcement confirmed that the election would take place on June 20th.
a note asking us to confirm when we would be arriving.