a. One who believes that it is impossible to know whether there is a God.
b. One who is skeptical about the existence of God but does not profess true atheism.
2. One who is doubtful or noncommittal about something.
1. Relating to or being an agnostic.
2. Doubtful or noncommittal: "Though I am agnostic on what terms to use, I have no doubt that human infants come with an enormous 'acquisitiveness' for discovering patterns" (William H. Calvin).
3. Computers Operable or functioning using any operating system or other digital technology. Often used in combination: software that is platform agnostic.
Word History: Agnostics do not deny the existence of God—instead, they hold that one cannot know for certain whether or not God exists. The term agnostic was coined by the 19th-century British scientist Thomas H. Huxley, who believed that only material phenomena were objects of exact knowledge. He made up the word from the prefix a-, meaning "without, not," as in amoral, and the noun Gnostic. Gnostic is related to the Greek word gnōsis, "knowledge," which was used by early Christian writers to mean "higher, esoteric knowledge of spiritual things"; hence, Gnostic referred to those with such knowledge. In coining the term agnostic, Huxley was considering as "Gnostics" a group of his fellow intellectuals—"ists," as he called them—who had eagerly embraced various doctrines or theories that explained the world to their satisfaction. Because he was a "man without a rag of a label to cover himself with," Huxley coined the term agnostic for himself, its first published use being in 1870.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.