Source

1. n. That from which anything comes forth, regarded as its cause or origin; the person from whom anything originates; first cause.
2. n. The act of rising; a rise; an ascent.
3. n. The rising from the ground, or beginning, of a stream of water or the like; a spring; a fountain.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.