1. To affirm to be true, genuine, or correct, asin an official capacity.
2. To establish or verify the usage of.
3. To provide evidence for; stand as proof of; SYN. certify, manifest, demonstrate, evidence.

1. To authorize by certificate.
2. To present someone with a certificate.

1. To declare legally insane.
2. To guarantee as meeting a certain standard; SYN. endorse.
3. To guarantee payment on; of checks.