confirm
Definitions
To establish the truth, accuracy, or validity of something.
To formally or officially ratify or validate an agreement or appointment.
To strengthen or settle a feeling, belief, or habit.
Examples
Please confirm your attendance by replying to this email.
The laboratory results will confirm whether the treatment was successful.
I need to call the hotel to confirm our reservation for next week.
Synonyms
verify validate corroborate substantiate affirm ratify endorse