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T he importance of understanding terms when discussing theology and doing apologetics cannot be overestimated.  This is why a Theological Dictionary is so important.  First, define terms.  Second, make statements using those terms.  Third, use scripture and logic to determine the validity of the statements. This is not an exhaustive list. Rebecca Writes has a great online dictionary. 
A
  • accomodation
  • active obedience of Christ
  • adiaphora
  • Adonai
  • adoption
  • adoptionism
  • advent
  • already/not yet
  • amanuensis
  • Ambrose of Milan
  • Amyraldianism
  • Amyraldism
  • analogy of faith
  • analogy of scripture
  • annihilationism
  • anthropology
  • anthropomorphism
  • anthropopathism
  • antinomianism
  • apocrypha (New Testament)
  • apocrypha (Old Testament)



  • ​



  • Apollinarianism
  • Apollinarius
  • apologetics
  • apophatic theology
  • apostasy
  • apostle
  • Apostles’ Creed
  • apostolic fathers
  • Arianism
  • Ark of the Covenant
  • Arminianism
  • ascension of Jesus
  • aseity
  • assurance 
  • Athanasian Creed
  • Athanasius
  • atheism
  • atonement
  • Augsburg Confession
  • Augustine of Hippo
  • Augustinianism
  • author of sin
  • authority of scripture
  • autographa
  • autographs
  • Argumentum ad hominem
  • Argumentum ad judicium
  • Argumentum ad populum
  • Argumentum ad verecundiam
  • Ark
  • Ark of the Covenant
  • Arianism
  • Armageddon
  • Arminianism
  • Ascended Master
  • Ascension
  • Aspersion
  • Assumption
  • Assumption of Mary
  • Assurance
  • Astral Projection
  • Astrology
  • Atheism
  • Atheism, Negative
  • Atheism, Positive
  • Atonement
  • Aura
  • Autograph
  • Autonomy
B
  • B.C.
  • B.C.E.
  • Baal
  • Babel
  • Babel, Tower of
  • Backsliding
  • Baptism
  • Baptism, Believer's
  • Baptism, Infant
  • Baptism for the Dead
  • Baptismal Regeneration
  • Beatitudes
  • Beautification
  • Beelzubub
  • Bible
  • Blasphemy
  • Blasphemy of the Holy Spirit
  • Blessed Sacrament
  • Book of Life
  • Born Again
  • Brazen Serpent
  • Bride of Christ
  • British Israelitism
  • Bull, Papal
C
  • C.E.
  • Caesar
  • Calvary
  • Calvinism
  • Canon
  • Capital punishment
  • Capital sins
  • Catechism of Catholic Church
  • Catholic
  • Causality
  • Celestial Law
  • Ceremony
  • Cessationism
  • Chakra
  • Channeling
  • Charismatic Gifts
  • Charity
  • Cherub/Cherubim
  • Chiliasm
  • Christ
  • Christian
  • Christianity
  • Christology
  • Church
  • Circumcision
  • Cities of refuge
  • Clergy
  • Codex
  • Commercial Theory
  • Common Grace
  • Communicatio idiomatum
  • Communicatio Essentiae
  • Communion
  • Complimentarianism
  • Concomitance
  • Concupiscence
  • Condemnation
  • Condign Merit
  • Conditional immortality
  • Congruent Merit
  • Confession
  • Confessional
  • Confirmation
  • Congregation
  • Consecrate
  • Consequentialism
  • Consequentialism
  •  Consubstantiation
  • Contingent
  • Contrition
  • Conversion
  • Conviction
  • Coptic
  • Corban
  • Cosmological argument
  • Cosmology
  • Council of Trent
  • Covenant
  • Covenant Theology
  • Creation
  • Creationism
  • Cross
  • Crucifixion
  • Cult
D
  • Damnation
  • Deacons
  • Dead Sea Scrolls
  • Death
  • Decalogue
  • Decrees, of God
  • Decretive Will
  • Deduction
  • Deism
  • Deity
  • Demigod
  • Demon
  • Deontology
  • Deposit of Faith
  • Depravity
  • Determinism
  • Deutero Isaiah
  • Devil
  • Diaconate
  • Diadem
  • Dialectic
  • Diaspora
  • Dichotomy
  • Didache
  • Didactics
  • Diocese
  • Disciple
  • Dispensation
  • Dispensationalism
  • Dittography
  • Divination
  • Divinity
  • DNA
  • Docetism
  • Doctrine
  • Documentary Hypothesis
  • Dogma
  • Donatism
  • Dormition
  • Double Predestination
  • Dowsing
  • Dualism
  • Duli
E
  • Ebionism
  • Ecclesiology
  • Economic Trinity
  • Eden
  • Edify
  • Efficacious Grace
  • Efficacy
  • Egalitarianism
  • Egypt
  • Eisegesis
  • Elder
  • Elect
  • Elohim
  • Embryonic Recapitulation
  • Empiricism
  • Entropy
  • Epistemology
  • Epistle
  • Equivocation
  • Erastianism
  • Eschatology
  • Eschaton
  • Essenes
  • Essentia
  • Eternal Generation
  • Eternal life
  • Eternal Security
  • Ethics
  • Eucharist
  • Eunuch
  • Eutychianism
  • Evil
  • Evolution
  • Evolution, Theistic
  • Ex-Nihilo
  • Ex opere operato
  • Example Theory
  • Excommunication
  • Exegesis
  • Existentialism
  • Exomologesis
  • Exorcism
  • Expiation
  • Extreme Unction
F
  • Faith
  • Faith, Deposit of
  • Fall, The
  • False Prophet, (The)
  • False Prophets
  • Falsifiability
  • Famine
  • Fast, Fasting
  • Fatalism
  • Father, The (God)
  • Fellowship
  • Fideism
  • Field of Blood
  • Filioque
  • Firstborn
  • First-fruits
  • First Person of the Trinity
  • Fission
  • Five Points of Arminianism
  • Foreknow, Foreknowledge
  • Foreordination
  • Forgiveness
  • Fornication
  • Fool
  • Foundationalism
  • Four Spiritual Laws
  • Free Knowledge
  • Free will
  • Freethinker
  • Fusion
G
  • Gaia
  • Gammatria
  • Gap Theory
  • Garden of Eden
  • Gehenna
  • General Revelation
  • Gentile
  • Gifts, Spiritual Gifts
  • Gihon
  • Glean
  • Glory
  • Glory of God
  • Glory of the Lord
  • Gnosticism
  • God
  • Godhead
  • Gods, False
  • Golgotha
  • Goliath
  • Good
  • Gospel
  • Governmental Theory
  • Grace
  • Grace, Actual
  • Grace, Sanctifying
  • Great Commission
  • Great White Brotherhood
  • Guardian Angel
  • Guilt
H
  • Hades
  • Hadith
  • Hamartiology
  • Haplography
  • Heaven
  • Hebrew
  • Hedonism
  • Hell
  • Henotheism
  • Heresy
  • Hermeneutics
  • Heterodoxy
  • Higher Self
  • Hierology
  • Holy, Holiness
  • Holy Orders
  • Holy Spirit
  • Holy Water
  • Homiletics
  • Homoiousios
  • Homoousios
  • Homophony
  • Host
  • Humanism
  • Humility
  • Hyper Calvinism
  • Hyperdulia
  • Hypostasis
  • Hypostatic Union
I
  •  Icon
  •  Iconoclasm
  •  Idealism
  •  Idol, Idolatry
  •  Ignosticism
  •  Immaculate Conception
  •  Image
  •  Image of God
  •  Immutability
  •  Impeccability
  •  Impute, Imputation
  •  Immortality
  •  Imprimatur
  •  In facto
  •  In fieri
  •  Incarnation
  •  Incarnational Theology
  •  Indefectibility
  •  Induction
  •  Indulgence
  •  Inerrancy
  •  Infant baptism
  •  Infidel
  •  Infinity
  •  Infralapsarianism
  •  Initium Fidei
  •  Inspiration
  •  Instrumental Cause
  • Intelligent Design
  • Intermediate state
  • Intinction
  • Irresistible Grace
  • Israel
  • Israelite
J
  • JEDP
  • Jehovah
  • Jehovah's Witnesses
  • Jesuit
  • Jesus
  • Jesus Only Movement
  • Jesus Seminar
  • Jews
  • Judgment
  • Just, Justice
  • Justify, Justification
K
  • Karma
  • Kathenotheism
  • Kenosis
  • Kinism
  • Kingdom of God

L
  •  Laity
  •  Latria
  •  Law
  •  Law of Excluded Middle
  •  Law of Identity
  •  Law of Non-Contradiction
  •  Law of Proper Inference
  •  Laying on of hands
  •  Lent
  •  Liberalism
  •  Limited atonement
  •  Liturgy
  •  Logic
  •  Logos
  •  Lord's Supper
  •  Love
  •  LXX
M
  • Magic
  • Major Prophets
  • Mammon
  • Man
  • Mantra
  • Manuscript
  • Materialism
  • Marriage
  • Martyr
  • Mass
  • Means of Grace
  • Mediation, Mediator
  • Medium
  • Megiddo
  • Mercy
  • Merit
  • Messiah
  • Metaphysics
  • Middle East
  • Middle Knowledge
  • Millennium
  • Minor Prophets
  • Minuscule
  • Miracle
  • Modalism
  • Molinism
  • Monarchianism
  • Monergism
  • Monism
  • Monogamy
  • Monolatry
  • Monophysitism
  • Monotheism
  • Moral Government Theology
  • Moral Influence Theory
  • Morality
  • Mormon
  • Mormonism
  • Mortal Sin
  • Moses
  • Murder
N
  • Natural Knowledge
  • Natural Theology
  • Naturalism
  • Naturalistic evolution
  • Nature
  • Negative Atheism
  • Nephilim
  • Neo-orthodoxy
  • New Atheism
  • New Testament
  • Nestorianism
  • Nihil Obstat
  • Nihilism
  • Nile, The
  • Normative Principle
  • Nun
O
  • Objectivism
  • Occam's Razor
  • Occult
  • Old Testament
  • Omnipotence
  • Omnipresence
  • Omniscience
  • Ontological Argument
  • Ontological Trinity
  • Ontology
  • Open Theism
  • Oracles
  • Ordain
  • Ordination
  • Ordo salutis
  • Original Sin
  • Orthodoxy
  • Other, Wholly
P
  • Paedocommunion
  • Paganism
  • Panentheism
  • Pantheism
  • Papyrus
  • Parable
  • Paraclete
  • Paradigm
  • Paradise
  • Parapsychology
  • Parish
  • Parousia
  • Pascals Wager
  • Passive Obedience
  • Passover
  • Pastor
  • Patriology
  • Patristic


  • Patrology
  • Pedobaptism
  • Pelagianism
  • Penance
  • Penal Substitution
  • Pentateuch
  • Pentecost
  • Permissive Decree
  • Permissive Will
  • Perseverance
  • Person
  • Philosophy
  • Pharisee
  • Pharaoh
  • Pishon
  • Pluralism
  • Pneumatology
  • Polygamy
  • Polytheism
  • Pope
  • Positive Atheism
  • Postmillennialism
  • Postmodernism
  • Pragmatism
  • Prayer
  • Pre-Adamites
  • Preceptive Will
  • Pre-existence
  • Predestine, Predestination
  • Premillennialism
  • Presuppositionalism
  • Preterism
  • Preterition
  • Prevenient Grace
  • Priest
  • Process Theology
  • Prophet
  • Propitiation
  • Prostration
  • Protoevangelium
  • Protestant
  • Purgatory

Q
  • Q, Quelle
  • Qumran
  • Quran, The
R
  • Rabbi, Rabonni
  • Ransom Theory
  • Rapture
  • Rationalism
  • Recapitulation Theory
  • Reconcile, Reconciliation
  • Redaction Criticism
  • Redemption
  • Reformed Theology
  • Regeneration
  • Regulative Principle
  • Reincarnation
  • Relativism
  • Relic
  • Religion
  • Religious Naturalaism
  • Remnant
  • Repentance
  • Replacement Theology
  • Resurrection
  • Revealed Theology
  • Revelation
  • Revelation, General
  • Revelation, Special
  • Righteousness
  • Rite
  • Ritual
  • Rosary
S
  • Sacerdotalism
  • Sacrament
  • Sacred Tradition
  • Sacrifice
  • Sadducee
  • Saint
  • Salvation
  • Sanctify, Sanctification
  • Sanctifying Grace
  • Sanhedrin
  • Saved
  • Savior
  • Scapular
  • Scholasticism
  • Science
  • Scientific Naturalism
  • Scribe
  • Scripture
  • Seance
  • Second Coming, The
  • Selah
  • Septuagint, The
  • Sign of the Cross
  • Sin
  • Skepticism

  • Socinianism
  • Sola Fide
  • Sola Gratia
  • Sola Scriptura
  • Soli Deo Gloria
  • Solus Christus
  • Son of God
  • Sorcery
  • Soteriology
  • Soul
  • Soul Sleep
  • Sovereignty
  • Special Revelation
  • Spirit
  • Spiritism
  • Spiritual
  • Spiritual Gifts
  • Spiritualism
  • Strict Merit
  • Subjectivism
  • Substitution
  • Supernatural
  • Supralapsarianism
  • Synagogue
  • Synergism
  • Synoptic Gospels
T
  • Tabernacle
  • Teleological argument
  • Teleology
  • Temptation
  • Terminism
  • Testament
  • Testimony
  • Tetragrammaton
  • Theism
  • Theistic Evolution
  • Theocracy
  • Theodicy
  • Theology
  • Theonomy
  • Theophany
  • Theosophy
  • Tithe
  • Total Depravity
  • Torah
  • Tradition
  • Tradition, Sacred
  • Traducianism
  • Transcendence
  • Transfiguration
  • Transcendental Idealism
  • Transliterate
  • Transubstantiation
  • Trent, Council of
  • Tribulation, The
  • Trichotomy
  • Trinity
  • Trinity, Economic
  • Trinity, Ontological
  • Tritheism
  • Truth
  • Type
  • Typology
U
  • Uncial
  • Unitarianism
  • Universalism
  • Urim and Thummim

V
  • Vellum
  • Veneration
  • Venial Sin
  • Vestigia Trinitatas
  • Vicar of Christ
  • Vicarious Atonement
W
  • Wholly Other
  • Word, The
  • Word of God
  • Worldview
  • Worship
  • Wrath

X
  • X-Nihilo

Y
  • YHWH
  • Yin and Yang
  • Yoga
Z
  • Zodiac
  • Zurich Agreement
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