adj. That which happens spontaneously, unintended and uninitiated.
adj. Since all things must come from something that causes them the uncaused cause is that one thing that began the chain of existance, often identified as God.
the GNU version of the Collaborative International Dictionary of English
adj. Having no antecedent cause; uncreated; self-existent; eternal.
The Century Dictionary and Cyclopedia
Having no precedent cause; existing without an author; uncreated; self-existent.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having no cause or apparent cause
Word Usage
"But, this being impossible, we must be content, wherever we stop, to contemplate the uncaused, that is, the unexplained; and then all that follows is only relatively explained."