inception

Definitions:

Beginning; first stage; as, the movement was successful from its inception.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
Beginning.
- Newage Dictionary DB (adjective) (adj.) (adjective)
A beginning.
- Newage Dictionary DB (noun) (n.) (noun)

Usage examples:

This white expansion becomes doubly interesting when we realize how sudden was its inception and how rapid its evolution.
- The Rising Tide of Color Against White World-Supremacy by Theodore Lothrop Stoddard
He has not done much more than this since his inception
- Opportunities in Engineering by Charles M. Horton
I have been Chairman of this Company since its inception two- and- thirty years ago.
- The Project Gutenberg Plays of John Galsworthy, Complete by John Galsworthy