validate (v.)

• accept
• accredit
• affirm
• approve
• assay
• attest
• audit
• authenticate
• authorize
• autograph
• back
• bolster
• buttress
• certificate
• certify
• charter
• check
• circumstantiate
• collate
• confirm
• constitute
• corroborate
• cosign
• countersign
• cross-check
• decree
• document
• double-check
• empower
• enable
• enact
• endorse
• enfranchise
• entitle
• essay
• establish
• experiment
• formulate
• fortify
• franchise
• initial
• justify
• legalize
• legislate
• legitimate
• legitimatize
• legitimize
• license
• notarize
• ordain
• pass
• patent
• permit
• prescribe
• privilege
• probate
• prove
• ratify
• regulate
• reinforce
• research
• sample
• sanction
• seal
• second
• sign
• strengthen
• substantiate
• support
• sustain
• taste
• test
• try
• undergird
• undersign
• underwrite
• uphold
• verify
• visa
• vise
• warrant