(1):
(n.) A primitive word, from which spring other words; a radical; a root; an etymon.
(2):
(n.) The root of a plant.
(3):
(n.) A number or quantity which is arbitrarily made the fundamental number of any system; a base. Thus, 10 is the radix, or base, of the common system of logarithms, and also of the decimal system of numeration.
(4):
(n.) A finite expression, from which a series is derived.