proginosko NT:4267, "to know before" (pro, "before," ginosko, "to know"), is used (a) of divine knowledge, concerning (1) Christ, 1 Peter 1:20, RV, "foreknown" (KJV, "foreordained"); (2) Israel as God's earthly people, Rom 11:2; (3) believers, Rom 8:29; "the foreknowledge" of God is the basis of His foreordaining counsels; (b) of human knowledge, (1) of persons, Acts 26:5; (2) of facts, 2 Peter 3:17.
B. Noun.
prognosis NT:4268, "a foreknowledge" (akin to A.), is used only of divine "foreknowledge," Acts 2:23; 1 Peter 1:2. "Foreknowledge" is one aspect of omniscience; it is implied in God's warnings, promises and predictions. See Acts 15:18. God's "foreknowledge" involves His electing grace, but this does not preclude human will. He "foreknows" the exercise of faith which brings salvation. The apostle Paul stresses especially the actual purposes of God rather than the ground of the purposes, see, e. g., Gal 1:16; Eph 1:5,11. The divine counsels will ever be unthwartable. Cf. FORESHEW
(from Vine's Expository Dictionary of Biblical Words, Copyright (c)1985, Thomas Nelson Publishers)
FOREKNOWLEDGE
In Rom 8:29 and 11:2, the apostle Paul's use of the word foreknew means "to choose" or "to set special affection on." The electing love of God, not foresight of human action, is the basis of His predestination and salvation (Rom 8:29-30,33). This same idea is used to express the nation of Israel's special relationship to God (Acts 2:23; Rom 11:2; 1 Peter 1:2,20).
(from Nelson's Illustrated Bible Dictionary, Copyright (c)1986, Thomas Nelson Publishers)