(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 zone of polarizing activity

(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.

plural of role activity diagram

(grammar, uncountable) the form in which the subject of a verb carries out some action / (grammar, countable) a form in a particular language used to express the active voice

(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.

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