Etymology
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binomial (n.)

1550s, "an algebraic expression consisting of two terms," from Late Latin binomius "having two personal names," a hybrid from bi- "two" (see bi-) + nomius, from nomen (from PIE root *no-men- "name"). In zoology and botany, "a name consisting of two terms, generic and specific."

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Definitions of binomial
1
binomial (adj.)
of or relating to or consisting of two terms;
binomial expression
binomial (adj.)
having or characterized by two names, especially those of genus and species in taxonomies;
binomial nomenclature of bacteria
Synonyms: binominal
2
binomial (n.)
(mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms;
From wordnet.princeton.edu