endorsement (n.)

• acceptance
• accord
• acquiescence
• adherence
• admiration
• affirmation
• affirmative
• agreement
• approbation
• approval
• assent
• authentication
• authorization
• autograph
• aye
• backing
• blessing
• certification
• cipher
• compliance
• confirmation
• connivance
• consent
• countenance
• countersign
• countersignature
• cross
• device
• eagerness
• esteem
• favor
• fiat
• go-ahead
• hand
• imprimatur
• indorsement
• mark
• monogram
• nod
• okay
• permission
• promptitude
• promptness
• ratification
• readiness
• respect
• sanction
• seal
• signature
• signet
• stamp
• submission
• subscription
• support
• validation
• visa
• vise
• voice
• vote
• warrant
• willingness
• yea