(chemistry) the increased stability of organic compounds having alternate single and double bonds

(pharmacology) The tendency of any medication or treatment, even an inert or ineffective one, to exhibit results simply because the recipient believes that it will work.

(fluid dynamics) In a flowing fluid, the occurrence of what is stated by Bernoulli's principle.

(US politics) The effect that a candidate for the corresponding political office (especially the office of President of the United States) can have on a close political election, when their candidacy results in the election being won by a candidate dissimilar to them, rather than a candidate similar to them.

(voting theory) the effect a minor party candidate with little chance of winning has upon a close election, when that candidate's presence in the election draws votes from a candidate similar to them, thereby causing a candidate dissimilar to them to win the election.

(physics) the conversion of electromagnetic radiation into electric power through absorption by a semiconducting material

(physics, fluid mechanics) The reduction in fluid pressure that results when a fluid flows through a constriction.

(chemistry) the mesomeric effect

(film, television) An effect that cannot be reasonably achieved by normal means, as for example by the digital manipulation of previously filmed footage.

(physics) Birefringence of a material induced by an electric field due to partial orientation of its molecules.