Riot control agent. After September 11, 2001, the _____________ was established to provide a framework that provides a comprehensive national approach, applicable at all jurisdictional levels and across functional disciplines.
noun, plural: chemicals. (1) A substance made up of chemical elements or produced from a chemical process. (2) A drug, especially illicit or addictive drug. adjective. Of, relating to, or pertaining to, chemistry or a chemical substance.
Definition of CHEMICAL for Kids. : any substance (as an acid) that is formed when two or more other substances act upon one another or that is used to produce a change in another substance.Spanish Central: Spanish translation of chemical. chemical. noun. : any substance (as an acid) that is formed when two or more other substances act upon one another or that is used to produce a change in another substance.