Algebra. an expression that is a sum or difference of two terms, as 3 x + 2 y and x 2 − 4 x.
Zoology, Botany. a taxonomic name consisting of a generic and a specific term, used to designate species.
Algebra. consisting of or pertaining to two terms or a binomial.
Zoology, Botany. consisting of or characterized by binomials.

1550–60; < Late Latin binōmi(us) having two names (compare Latin binōminis) + -al1. See bi-1, nominal

binomialism, noun
binomially, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
binomial (baɪˈnəʊmɪəl)
1.  a mathematical expression consisting of two terms, such as 3x + 2y
2.  See binomial nomenclature a two-part taxonomic name for an animal or plant
3.  referring to two names or terms
[C16: from Medieval Latin binōmius from bi-1 + Latin nōmenname]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Cite This Source's 21st Century Lexicon
Main Entry:  binomial
Part of Speech:  n
Definition:  See binominal name's 21st Century Lexicon
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Word Origin & History

1550s, from L.L. binomius "having two personal names" (from bi- + nomius, from nomen; see name). Taken up 16c. in the algebraic sense "consisting of two terms."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

binomial bi·no·mi·al (bī-nō'mē-əl)
Consisting of two terms or names, such as the genus and species names of organisms. n.
A taxonomic name used in binomial nomenclature.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
binomial   (bī-nō'mē-əl)  Pronunciation Key 
A mathematical expression that is the sum of two monomials, such as 3a + 2b.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Ultimately, even our higher thought processes can be reduced to the same binomial reductionism.
And so on for each successive locus, resulting in a biological binomial distribution.
Binomial nomenclature helps us to understand the relationship between animals.
When dealing with large populations, the sample size is determined using the normal approximation to the binomial distribution.
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