OK
accept
accredit
affirm
amen
approve
assay
attest
audit
authenticate
authorize
autograph
back
back up
bear out
bolster
bring to test
buttress
certificate
certify
charter
check
check and doublecheck
check out
check over
circumstantiate
collate
confirm
constitute
corroborate
cosign
countersign
cross-check
cut and try
declare lawful
decree
document
double-check
empower
enable
enact
endorse
enfranchise
entitle
essay
establish
experiment
formulate
fortify
alter
change
modify
substantiate
support
sustain
validated
validates
validating
valid
validation
validator