Agnosticism

n. belief that knowledge is limited to human experience

Agnosticism (from the Greek a, meaning "without", and gnosticism or gnosis, meaning "knowledge") is the philosophical view that the truth value of certain claims—particularly metaphysical claims regarding theology, afterlife or the existence of God, gods, deities, or even ultimate reality—is unknown or, depending on the form of agnosticism, inherently unknowable due to the nature of subjective experience. In western laypersons terms, an Agnostic is one who doesn't believe you can prove there's a God, but doesn't deny it's possible a God may exist.
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Noun
1. a religious orientation of doubt; a denial of ultimate knowledge of the existence of God; "agnosticism holds that you can neither prove nor disprove God's existence"
(hypernym) religious orientation
2. the disbelief in any claims of ultimate knowledge
(synonym) skepticism, scepticism
(hypernym) unbelief, disbelief

(n.)
The doctrine that the existence of a personal Deity, an unseen world, etc., can be neither proved nor disproved, because of the necessary limits of the human mind (as sometimes charged upon Hamilton and Mansel), or because of the insufficiency of the evidence furnished by physical and physical data, to warrant a positive conclusion (as taught by the school of Herbert Spencer); -- opposed alike dogmatic skepticism and to dogmatic theism.
  

(n.)
That doctrine which, professing ignorance, neither asserts nor denies.
  

Agnosticism [from Greek a not + gnostos known] The mental attitude denying the possibility of the real knowledge of truth and hence of the ultimate or fundamental nature of the universe. The term was coined by T. H. Huxley to denote his own attitude, in contrast to Gnosticism which implies the possibility of knowing truth and the inner and invisible realities of the universe. It differs from atheism in not denying the existence of God or cosmic divinities.