/,sɜ:tɪfɪ'keɪʃn; ,sɝtəfə`keʃən/
n [U] action of certifying or state of being certified 证明.

n
[U and C]
an official document that says that someone is allowed to do a certain job, that something is of good quality etc
　We successfully completed the certification for open water diving.
[U]
the process of giving someone or something an official document that says they are allowed to do a certain job, that something is of good quality etc
certification of
　certification of competence