de·ism (dē'ĭz'əm, dā'-) n. The belief, based solely on reason, in a God who created the universe and then abandoned it, assuming no control over life, exerting no influence on natural phenomena, and giving no supernatural revelation.
[French déisme, from Latin deus, god; see dyeu- in Indo-European roots.] de'ist n., de·is'tic adj., de·is'ti·cal·ly adv.