Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Modern Latin
Origin: binomium, from Latin binominis, from bi- ( BI-) + nomen 'name'

binomial

 noun
     
Related topics: Maths
bi‧no‧mi‧al [countable]
HM technical a mathematical expression that has two parts connected by the sign + or the sign -, for example 3x + 4y or x - 7
—binomial adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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