as it is used in this verse, means, Saved from evil; rescued; set free; released.

Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light: Who hath delivered us from the power of darkness, and hath translated us into the kingdom of His dear Son: In whom we have redemption through His blood, even the forgiveness of sins.
Colossians 1:12-14