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This is a dictionary taken (with permission) from the website of CARM.ORG (Matt Slick). These are definitions of theological terms. Excellent!
Buck’s Theological Dictionary still contains some interesting material, especially when it comes to Religious Sects.
A Dictionary of Catechisms from Puritan, Reformed, and several other denominations, such as Baptists, Broadus, Gadsby, Owen, etc.
This is an old dictionary of Christianity in which a lot of unused (in modern speech) terms are defined. Over 1500 entries.
Heresies of the Church Thru the Ages
Dictionary of Creeds and Confession throughout Church History, from the New Testament Times to the Twentieth Century.
Richard Watson published Biblical and Theological Dictionary in 1831-32, following his Theological Institutes, the first Methodist theology. This 5 volume dictionary contains 1,600+ entries ranging from a paragraph to several pages. Watson addresses philosophical issues, comparative religions, apologetics, matters of hermeneutics, and basic Christian beliefs.
Baker’s Evangelical Dictionary of Biblical Theology is a 753 entry dictionary of Theology.