admission
affidavit
affirmation
allegation
assertion
asseveration
attest
authentication
authority
authorization
averment
avouchment
avowal
backing
backing up
bearing out
bill of health
bolstering
buttressing
certificate
certificate of proficiency
certification
circumstantiation
compurgation
confirmation
corroboration
corroboratory evidence
credential
declaration
deposition
diploma
disclosure
documentation
evidence
fortification
instrument in proof
legal evidence
navicert
notarized statement
note
profession
proof
proving
proving out
ratification
reinforcement
sheepskin
statement
statement under oath
strengthening
testimony
substantiation
verification