addition

(redirected from in addition)
Also found in: Dictionary, Thesaurus, Legal, Idioms, Encyclopedia.
Related to in addition: however, also

addition

Etymology: L, additio, something added
a chemical reaction in which two complete molecules combine to form a new product, usually by attachment to carbon atoms at a double or triple bond of one of the molecules.

addition

(ă-di′shŏn) [L. addere, to add]
In chemistry, a reaction in which two substances unite without loss of atoms or valence.