The meaning of Sanctification in the Bible
(From Easton's Bible Dictionary)

involves more than a mere moral reformation of character, brought about by the power of the truth: it is the work of the Holy Spirit bringing the whole nature more and more under the influences of the new gracious principles implanted in the soul in regeneration. In other words, sanctification is the carrying on to perfection the work begun in regeneration, and it extends to the whole man (Romans 6:13; 2co 4:6; Colossians 3:10; I John 4:7; I Corinthians 6:19). It is the special office of the Holy Spirit in the plan of redemption to carry on this work (I Corinthians 6:11; 2th. 2:13). Faith is instrumental in securing sanctification, inasmuch as it (1) secures union to Christ (Galatians 2:20), and (2) brings the believer into living contact with the truth, whereby he is led to yield obedience "to the commands, trembling at the threatenings, and embracing the promises of God for this life and that which is to come."

See more on the meaning of Sanctification in the Bible:
Sanctification {International Standard Bible Encyclopedia}

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