What's Happening in Erie County. 1  September 1 - September 30 : Agricultural Districts Open Enrollment Period. 2  September 4 : Erie County Government offices are closed today. 3  September 5 : Justice Assistance Grant (JAG) Public Notification - Fiscal Year 2017.
Definition. 1  As a noun, the common definition of chemical is a substance that is produced or used in a process (reaction) involving changes to atoms or molecules. 2  As an adjective, chemical means of or pertaining to chemistry.
chemical noun [C]. B2 any âbasic âsubstance that is used in or âproduced by a âreaction âinvolving âchanges to âatoms or âmolecules: The âgovernment has âpledged to âreduce the âamount of chemicals used in âfood âproduction. Each âyear, âfactories ârelease millions of âtons of âtoxic (= âpoisonous) chemicals into the âatmosphere.