Toll definition, a payment or fee exacted by the state, the local authorities, etc., for some right or privilege, as for passage along a road or over a bridge. See more. Dictionary.com
The International Union of Pure and Applied Chemistry (IUPAC, /ËaÉªjuËpÃ¦k/ or /ËjuËpÃ¦k/) is an international federation of National Adhering Organizations that represents chemists in individual countries. It is a member of the International Council for Science (ICSU).
IUPAC is best known for its works standardizing nomenclature in chemistry and other fields of science, but IUPAC has publications in many fields including chemistry, biology and physics.