plural of activation analysis

(organic chemistry) Any of a wide range of techniques, often using catalysts, in which a carbon to hydrogen covalent bond of an organic compound is made to cleave in order to replace the hydrogen with a functional group.

In set dances with more than one couple dancing, the couple doing the more complicated movement during any given portion of the dance. The role of active couple may pass from one couple to another. In many quadrilles, certain figures will have two active couples at any one time; in long set dances, quite often every other couple or every third couple is the active couple.

plural of active couple

(chemistry) A transitional structure, in an energetically excited state, that forms between the reactants of a chemical reaction and breaks down to form the products

The specific compound in a natural or man-made mixture that is responsible for the mixture's activity.

(astronomy) A galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy.

(chemistry, of a crystal or compound) Exhibiting optical activity.

capable of lowering the surface tension of a liquid

(law, often derogatory) The act of replacing an impartial interpretation of existing law with the judge's personal feelings about what the law should be.