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[bahy-noh-mee-uh l] /baɪˈnoʊ mi əl/
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
Related forms
binomialism, noun
binomially, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for binomial
  • 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.
  • The list of factorial and binomial topics contains a large number of related links.
British Dictionary definitions for binomial


a mathematical expression consisting of two terms, such as 3x + 2y
a two-part taxonomic name for an animal or plant See binomial nomenclature
referring to two names or terms
Derived Forms
binomially, adverb
Word Origin
C16: from Medieval Latin binōmius from bi-1 + Latin nōmenname
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for binomial

See binominal name's 21st Century Lexicon
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Word Origin and History for binomial

1550s (n.); 1560s (adj.), from Late Latin binomius "having two personal names," a hybrid from bi- (see bi-) + nomius, from nomen (see name (n.)). Taken up 16c. in the algebraic sense "consisting of two terms."

Online Etymology Dictionary, © 2010 Douglas Harper
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binomial in Medicine

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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binomial in Science
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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