(sociology) the observation that people often do or believe what they think many other people do.

An effect; especially, one that is experienced only after a delay, or only in the long term.

The secondary emission of an electron following the ionisation of a core electron of an atom.

plural of after-effect

(law) A discouraging effect, especially on certain forms of officially legal speech. / Synonym of windchill.

(psychology) The phenomenon that someone is less likely to help another if other potential helpers are present than otherwise.

(economics) The higher growth rate of businesses with higher market share in those segments of economy in which the value of a product or service depends on the compounding effects of the number of existing users of the product or a service, as is the case with telephone networks.

(atmospheric chemistry) The decrease in the ratio of heavier to lighter isotopes of carbon in atmospheric carbon dioxide due to anthropogenic emissions.

(geology) The appearance of lower sedimentation rates in stratigraphic sections covering greater amounts of time, as a result of the relative rarity of geologic events that remove large amounts of sediment.

(US) The idea that increased scrutiny of police following the 2014 shooting of Michael Brown in Ferguson, Missouri has led to an increased crime rate (or sometimes murder rate) in major US cities.