Involving or relating to two molecules, especially in chemistry when a reaction requires exactly two molecules to interact.
From bi- (two) + molecular (from molecule, from Latin moles, a mass). Chemistry term that emerged in the 19th century with molecular theory.
Bimolecular reactions are common in chemistry—when two molecules bump into each other and transform, it's a bimolecular collision, and these reactions follow different mathematical patterns than single-molecule reactions!
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