verification (n.)

• affirmation
• assay
• assurance
• attestation
• authentication
• backing
• buttressing
• certification
• check
• collation
• confirmation
• corroboration
• criterion
• crucible
• determination
• documentation
• essay
• establishment
• fortification
• ordeal
• probation
• proof
• proving
• ratification
• reassurance
• reinforcement
• standard
• strengthening
• substantiation
• support
• test
• touchstone
• trial
• try
• validation