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order

Pronunciation: or'der

Definition:

  1. In biologic classification, the division just below the class (or subclass) and above the family.
  2. In a reaction, order is the sum of the exponents of all the concentration terms in that reaction's rate expression. For example, for the natural decomposition of nitrogen pentoxide, the rate expression is v = -d[N2O5]/dt = k1[N2O5]. Thus, this is a first-order reaction. A reaction involving two different compounds is often a second-order reaction (but not necessarily so). Pseudo–first-order reactions are multiorder reactions in which one of the reactants is in substoichiometric amounts.
  3. The sequence of residues in a heteropolymer.

[L. ordo, regular arrangement]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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