(chemistry) A principle stating that, if a chemical system at equilibrium experiences a change in concentration, temperature, or total pressure, the equilibrium will shift in order to minimize that change.

(physics) The observation that the sums and differences of the frequencies of spectral lines often equal other observed frequencies; a consequence of quantum mechanics.

The axiom that "machines should work; people should think".

(evolutionary biology) A principle of asymmetry in selective pressure between predators and prey.

Alternative form of life-dinner principle

(philosophy) The proposition that nothing happens without a sufficient reason why it should be as it is and not otherwise.

(historical) The political philosophy espoused by Sun Yat-sen and the Chinese Nationalist Party.

(logic) principle of explosion

(business) A rule according to which decisions and transactions need approval from two individuals, typically the CEO and CFO.

A principle in biology stating that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.