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What is another word for confirm?

What's another word for confirm? | Here's a list of synonyms for confirm.

Definition 1: make more firm - [verb of change]

Definition 1: establish or strengthen as with new evidence or facts - [verb of cognition]

Definition 1: strengthen or make more firm - [verb of communication]

Definition 1: administer the rite of confirmation to - [verb of social]

Definition 1: support a person for a position - [verb of social]