Glossary O

Operations is defined as flexible, reversible mental manipulations of objects, in which objects can be mentally transformed and then returned to their original states. In Piaget's theory, particular types of cognitive schemes that are mental (that is, require symbols), derive from action, exist in organized systems (structures of the whole), and follow a set of logical rules, most importantly that of reversibility .

opiate refers to addictive psychoactive substance such as heroin, opium, or morphine that causes temporary euphoria and analgesia that reduces pain

Opiate drugs is a class of drugs derived from, or similar to those derived from, opium poppies. Please see also Opiate

Opiates refer to narcotic drugs derived from the opium poppy.

Opinion Evidence refers to evidence which generally is inadmissible in court, opinions can be provided by lay and expert witnesses
Opinions are beliefs that are tentative and modifiable in light of new information and, therefore, reasonable according to Nietzsche. Please see also Convictions.
Opioid is defined as a chemical such as opium, heroin, and other molecules with related structures that reduce pain and induce feelings of euphoria.

Opioid are systems responsive to opiate drugs and similar chemicals

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