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).
OPAC (Online Public Access Catalog) An Online Public Access Catalog (often abbreviated as OPAC or simply Library Catalog) is an online. database of materials held by a library or group of libraries. It is a computerized library catalog available. to the public. Most OPACs are accessible over the Internet to users all over the world.