Agnostisism

A quote from An introduction to Atheism:

The term 'agnosticism' was coined by Professor Huxley at a meeting of the Metaphysical Society in 1876. He defined an agnostic as someone who disclaimed ("strong") atheism and believed that the ultimate origin of things must be some cause unknown and unknowable. Another way of putting it is an agnostic is someone who believes that we do not and cannot know for sure whether God exists.

Since that time, however, the term agnostic has also been used to describe those that do not believe that the question is intrinsically unknowable, but instead believe that the evidence for or against God is inconclusive, and therefore are undecided about the issue.

To reduce the amount of confusion over the use of term agnosticism, it is recommended that usage based on the original definition be qualified as "strict agnosticism" and usage based on the second definition be qualified as "empirical agnosticism".