Definition: A primitive word, from which spring other words; a radical;
a root; an etymon.
Definition: 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.
Definition: A finite expression, from which a series is derived.
Definition: The root of a plant.