Question

what is the meaning of binomial

http://www.m-w.com/cgi-bin/dictionary

two names

It is used to identify plants

You can look it up in an online dictionary. I did.

<B>Main Entry: bi·no·mi·al
Pronunciation:</B> bI-'nO-mE-&l
<B>Function:</B> noun
<B>Etymology:</B> New Latin binomium, from Medieval Latin, neuter of binomius having two names, alteration of Latin binominis, from bi- + nomin-, nomen name —more at NAME
<B>Date:</B> 1557
1 : a mathematical expression consisting of two terms connected by a plus sign or minus sign
2 : a biological species name consisting of two terms
<B>- binomial</B> adjective
<B>- bi·no·mi·al·ly</B> /-mE-&-lE/ adverb

I hope this helps a little more. Thanks for asking.