Certify \Cer"ti*fy\, v. t. [imp. & p. p. Certified; p. pr. & vb. n. Certifying.]

[F. certifier, LL. certificare; L. certus certain + facere to make. See Certain, and cf. Certificate, v. t.]

1. To give cetain information to; to assure; to make certain.

We certify the king, that . . . thou shalt have no portion on this side the river. --Ezra iv. 16.

2. To give certain information of; to make certain, as a fact; to verify. --Hammond.

The industry of science at once certifies and greatly extends our knowledge of the vastness of the creation. --I. Taylor.

3. To testify to in writing; to make a declaration concerning, in writing, under hand, or hand and seal.

The judges shall certify their opinion to the chancellor, and upon such certificate the decree is usually founded. --Blackstone.

Certified check, A bank check, the validity of which is certified by the bank on which it is drawn.

Source: Webster's Revised Unabridged Dictionary (1913)