1. the action or process of providing or obtaining an official document attesting to a status or level of achievement
2. an official document that serves as proof of a status, qualification, or level of achievement

Examples

• She completed her teaching certification last spring.
• The company requires certification in safety procedures.
• His medical certification expires next year.
• The certification process took six months to complete.
• You need proper certification to operate heavy machinery.
• The school offers certification programs in various trades.
• Her nursing certification is recognized in all fifty states.