Wiktionary
n. (context theology English) A Christian doctrine, one of the five points of Calvinism, stating that Jesus Christ's substitutionary atonement on the cross is extended to those predestined to become a believer, at God's discretion and without condition.
Wikipedia
Unconditional election (also known as unconditional grace) is a reformed doctrine relating to Predestination that describes the actions and motives of God in eternity past, before He created the world, where he predestinated some people to receive salvation, the elect, and the rest he left to continue in their sins and receive the just punishment, eternal damnation, for their transgressions of God's law as outlined in the old and new Testaments of the Bible. God made these choices according to his own purposes apart from any conditions or qualities related to those persons.
The counter-view to unconditional election is conditional election, the belief that God chooses for eternal salvation those whom he foresees will have faith in Christ in part through an act of human free will.