| unimolecular | Denoting a single molecule. Synonym: monomolecular. (05 Mar 2000) |
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| unimolecular reaction | A reaction involving a single molecule (e.g., decomposition, intramolecular rearrangement, intramolecular oxidation or reduction), even if a catalytic agent, such as acid or alkali, is present in large excess, on a molecular basis, or is not rate-determining; such reaction's are usually first-order reaction's. Compare: molecularity. Synonym: unimolecular reaction. (05 Mar 2000) |
| unimolecular step | <chemistry> A reaction involving one species (09 Jan 1998) |