uninsured first-class mail requiring proof of delivery.
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- certification mark,
- certified accountant,
- certified check,
- certified milk,
- certified pasteurized milk,
- certified professional secretary,
- certified public accountant,
Origin of certified mail
First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019