of, at, or forming the base.

forming a basis; fundamental; basic.

Physiology .

indicating a standard low level of activity of an organism, as during total rest.

of an amount required to maintain this level.

Medicine/Medical . serving to induce a preliminary or light anesthesia prior to total anesthetization.

adjective

basic , beginning , rudimental , rudimentary , foundational , fundamental , original , primary , underlying , easy , elementary , initial , lowest , necessary