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##### The Collaborative International Dictionary

1. (Philol.) A primitive word, from which spring other words; a radical; a root; an etymon.

2. (Math.)

1. 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.

2. (Alg.) A finite expression, from which a series is derived. [R.]
--Hutton.

3. (Bot.) The root of a plant.

##### Wiktionary

n. 1 (context linguistics English) A primitive word, from which other words may be derived. 2 (context biology English) A root. 3 (context mathematics English) The number of distinct symbols used to represent numbers in a particular base, as 10 for decimal.

##### WordNet
1. n. (numeration system) the positive integer that is equivalent to one in the next higher counting place; "10 is the radix of the decimal system" [syn: base]

##### Wikipedia

In mathematical numeral systems, the radix or base is the number of unique digits, including zero, used to represent numbers in a positional numeral system. For example, for the decimal system (the most common system in use today) the radix is ten, because it uses the ten digits from 0 through 9.

In any standard positional numeral system, the number x and its base y are conventionally written as (x), although for base ten the subscript is usually assumed and not written, as it is the most common way to express value. For example, (100) (in the decimal system) represents the number one hundred, while (100) (in the binary system with base 2) represents the number four.

Radix is a science fiction novel by A. A. Attanasio, published in 1981. It was nominated for the Nebula Award for Best Novel in 1981. It is the first of four books in Attanasio's Radix Tetrad, followed by In Other Worlds in 1984.

The novel is being re-issued by Phoenix Pick, an imprint of Arc Manor Publishers in 2010.

Radix is a genus of air-breathing freshwater snails, aquatic pulmonate gastropods in the family Lymnaeidae, the pond snails.

The genus Radix has a Palaearctic distribution.

A radix, or base, is the number of unique digits, including zero, used to represent numbers in a positional numeral system.