n. someone or something that causes or produces an effect.
the GNU version of the Collaborative International Dictionary of English
n. One who or that which causes.
The Century Dictionary and Cyclopedia
n. One who or that which causes; the agent or act by which an effect is produced.
Word Usage
"Through our brief examination of nature, we have seen that the causer is a superior intellectual being who incorporated intelligence, reasoning, planning, design, and order into all that he created."