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Belief in the existence of a god or gods, especially belief in a personal God as creator and ruler of the world.

the′ist n.
the·is′tic, the·is′ti·cal adj.
the·is′ti·cal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.theistical - of or relating to theism
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Then he recited in English an Arya-Somaj prayer of a theistical nature, and stuffed his mouth with pan and betel.
One of several nicknames for Texas, Chili State transposes to theistical (Webster's Third & OED).
In view of vehement public rejection of atheism as a reprehensible attitude, the minister displays great tolerance by admitting: "it concerns us to know that, while Christian and most theistical writers lay the foundation of morals in the being of God [...] an ethical basis may be found, independently of theism, in the nature of man; that morality is not so dependent on theological belief that the two must stand or fall together" (H 1884, 92).