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.
n. 1. (Chemistry) any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use. adj. 2. (Chemistry) of or used in chemistry: chemical balance. 3. (Chemistry) of, made from, or using chemicals: chemical fertilizer.(ËkÉm Éª kÉl). n. adj.. a substance produced by or used in chemistry. 2. chemicals, Slang. narcotic or mind-altering drugs or substances. 3. of, used in, produced by, or concerned with chemistry or chemicals: a chemical formula. 4. used in chemical warfare: chemical weapons.