Noah Webster's New International Dictionary of the English Language

1. (a.) Pertaining to seed; providing an origin for development; as, the seminal discovery of new branch of science.

2. (a.) Contained in seed; holding the relation of seed, source, or first principle; holding the first place in a series of developed results or consequents; germinal; radical; primary; original; as, seminal principles of generation; seminal virtue.

3. (n.) A seed.