(US) First class mail that provides the sender proof of mailing and a delivery record.

(US) A check (cheque) for which the bank verifies that sufficient funds exist in the account to cover the check, and so certifies, at the time the check is written.

plural of certified check

(Australia, finance) A statement of earnings from an employer or government department, used for taxation purposes.

simple past tense and past participle of self-certify

In accordance with self-certification.

(UK) The act of an employee certifying that he/she was absent from work due to sickness, and is eligible for statutory sick pay.

That certifies.

The quality of being certifiable.

A medical certificate.