Definition of: basic

(bā′sik) adjective
1. Pertaining to, forming, or like a base or basis.
2. Essential; fundamental.
3. Chem. a Above normal in base-producing constituents: a basic salt, b Yielding hydroxyl ions when dissolved in an ionizing solvent, c Showing an alkaline reaction.
4. Geol. Containing comparatively little silica: said of igneous rocks, as basalt.
5. Metall. Designating the basic process of making steel.
—noun In the U.S. Army, an enlisted man who has completed or is pursuing the minimum course of military training.