/'sɜ:tɪfaɪ; `sɝtə,faɪ/
v (pt, pp -fied)
1 [Tn, Tf, Cn.a, Cn.n/a, Cn.t] ~ sb/sth as sth formally declare (sth), esp in writing or on a printed document （尤指书面）证明（某事物）
*a document certifying sb's birth 证明某人出生的文件
* He certified (that) it was his wife's handwriting. 他证明那是他妻子的手迹.
* The accused has been certified (as) insane/certified to be insane. 被告有书面证明为精神失常.
2 [Tn esp passive 尤用于被动语态] officially declare (sb) to be insane 正式证明（某人）精神失常
*He was certified and sent to a mental hospital. 他经诊断为精神失常而送往精神病院.

v past tense and past participlecertifiedpresent participlecertifyingthird person singularcertifies [T]

[Date: 1300-1400; Language: French;Origin: certifier, from Late Latin certificare, from Latin certus; CERTAIN¹]
to state that something is correct or true, especially after some kind of test
　The accounts were certified by an auditor.
certify (that)
　We need to certify that the repairs have been satisfactorily carried out.
certify sb dead
(=when a doctor says officially that a person is dead) BrE
　The driver was certified dead at the scene.
to give an official paper to someone which states that they have completed a course of training for a profession
→certificatecertify sb as sth
　She was certified as a teacher in 1990.
to officially state that someone is mentally ill