Pronunciation: (ag-nos'tik),[key] —n. 1. a person who holds that the existence of the ultimate cause, as God, and the essential nature of things are unknown and unknowable, or that human knowledge is limited to experience.
2. a person who denies or doubts the possibility of ultimate knowledge in some area of study.
—adj. 1. of or pertaining to agnostics or agnosticism.
2. asserting the uncertainty of all claims to knowledge.