Calling is God's summons to people through his revealed word and gospel, and in some passages God's appointment of particular people to a role or purpose. The meaning of calling must be determined by the passage's audience and context.

Compatibilism is the view that God's exhaustive determination of events and human moral responsibility can coexist without contradiction. In Calvinist compatibilism, a person is free when acting voluntarily according to personal desires, inclinations, and character, even if those desires and actions have been rendered certain by God's sovereign decree.

Corporate election is God's choice of a people or group in Christ, with individuals sharing in that chosen identity and its promises by being united to Christ through faith.

Divine foreknowledge is God's knowledge of what will happen before it happens, including future events and human choices. The term describes what God knows; it does not by itself establish that God causes every event he knows.

Double predestination is the teaching that God's eternal decree determines both who will be saved and who will be lost: some are predestined to eternal life, and the rest are ordained to condemnation.

Election is God's choice of a person, people, messenger, or group for a particular purpose. Its meaning must be determined by the object, purpose, and context of each passage.

Faith is a trusting response to God's revealed promise, expressed by believing in Jesus Christ and relying on him for salvation.

Free will is the capacity to make meaningful choices and act intentionally among available options, within the limits of human nature and circumstance.

God's sovereign rule means that he is the rightful King of creation, is never threatened or surprised, and can accomplish his purposes without needing to determine every human choice or event.

Human depravity is the universal condition of sin, moral corruption, and alienation from God. It means that people cannot save themselves or earn righteousness, but it does not mean that they are unable to understand or respond to the Gospel.

Human responsibility is the accountability people have to respond to God's revealed will and to answer for their choices. It includes responsibility to believe, repent, obey, and turn from sin when God makes his will known.

Judicial hardening is God's act of confirming a person or group in a rebellious course as an act of judgment, while using that rebellion to accomplish a wider purpose.

Monergism is the theological claim that God's work alone is the source and decisive cause of salvation. In Calvinist usage, it commonly means that God alone produces the effectual call, regeneration, and saving faith, so no human response determines whether a person is saved.

Original sin refers to humanity's solidarity with Adam's fall and the sinful condition shared by all people. It explains why sin, death, corruption, and the need for redemption mark the human race, while leaving the precise relationship between Adam's guilt and each person's own guilt to the biblical texts.

Perseverance is the believer's continuing in faith, endurance, and obedience in Christ. In Calvinism, the "perseverance of the saints" is the claim that every elect person will certainly persevere to the end. Decalvinised distinguishes that claim from eternal security, which rests on God's promise to keep those who are in Christ.

Predestination is God's predetermined redemptive plan to justify, sanctify, adopt, and glorify those who are in Christ through faith.

Prevenient grace is God's gracious initiative before conversion. God does the initial work by revealing himself, providing the gospel, sending Christ, and calling people to respond. Decalvinised uses the term in this general sense rather than as a technical explanation that fallen humanity must first receive an additional grace before the gospel can be believed.

Regeneration is God's gracious work of giving new spiritual life in Christ, transforming a person's heart and relationship to God.

Spiritual death is humanity's separation and alienation from God because of sin. It describes a person's condition outside spiritual fellowship and life with God, not the inability to hear, understand, or respond to God's call.

Synergism is the view that God and human beings both have a role in salvation. The term can mean that God's grace and a person's response are both necessary, but it does not by itself establish that the human response earns salvation or shares in Christ's saving work.

Theistic determinism is the view that God has determined every event and human choice so that no other outcome was possible.

The Westminster Confession of Faith is a Reformed statement of doctrine completed by the Westminster Assembly in 1646. It is one of the most influential confessions in Presbyterian and Reformed churches and a standard primary source for what Calvinism teaches.