(psychology) Aimless, often self-comforting behavior displayed when in doubt, blocked or frustrated. / (more broadly) Something done needlessly when procrastinating.

plural of activation analysis

(chemistry) Any of several similar radiochemical techniques of analysis in which a subatomic particle or gamma ray is captured by a nuclide to form a second stable nuclide which is then measured.

The increase in rate of a chemical reaction caused by the presence of a catalyst. / An amount of catalyst, expressed as the increase of the rate of its reaction.

(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

plural of neutron activation analysis

(embryology) A region of mesenchymal connective tissue that carries instructions which direct the developing limb bud to form along the anterior-posterior axis.

plural of role activity diagram

(business) A diagram illustrating the roles of people, teams, etc. in an organization and how they interact with each other and in response to external events.

(physics) The differential Raman scattering of left and right circularly polarized light by chiral molecules.