原

spot (marketed) crude oil

gram atom

Physics

Pauli exclusion principle; Pauli's principle

full-cost principle

Huygens' principle

cosmological principle

Polluter Pays Principle; PPP

acceleration principle

base powder; bulk powder

corporate accounting principles

light-water nuclear reactor

wilderness preservation

cost management; cost tracking

European Atomic Community; Euratom

highly pathogenic avian influenza (i.e. H5N1)

principle holding that any matters left unresolved at the end of one Diet session are not to be carried over to the next

Law

clausula rebus sic stantibus (legal principle that agreements become non-binding if there is a major, unforeseeable change of circumstances)

standing (of a legal case, e.g. whether there are grounds to prosecute)

area where a string of nuclear power plants are located

law of excluded middle

ability-to-pay principle (of taxation)

benefit principle (of taxation)

Christianity

Immaculate Conception

cesium atomic clock