Definition From the Westminster Confession of Faith (Unconditional Election)
3.5 Those of mankind that are predestinated unto life, God, before the foundation of the world was laid, according to His eternal and immutable purpose, and the secret counsel and good pleasure of His will, hath chosen in Christ unto everlasting glory, out of His mere free grace and love, without any foresight of faith or good works, or perseverance in either of them, or any other thing in the creature, as conditions, or causes moving Him thereunto; and all to the praise of His glorious grace.
3.6 As God hath appointed the elect unto glory, so hath He, by the eternal and most free purpose of His will, foreordained all the means thereunto. Wherefore, they who are elected being fallen in Adam, are redeemed by Christ; are effectually called unto faith in Christ by His Spirit working in due season; are justified, adopted, sanctified, and kept by His power, through faith, unto salvation. Neither are any other redeemed by Christ, effectually called, justified, adopted, sanctified, and saved, but the elect only.