To become enforceable, or applicable.

An accelerating growth of magnitude, including fame, fortune, importance, or danger.

The state in which a series of repeated actions have an effect greater than the sum of their individual effects; noted especially in the repeated administration of drugs or repeated consumption of trace elements or chemicals that show no immediate effect.

The circumstance in which one event instigates an expansive set of other events.

(physics) The polarization of the spin of electrons produced when alkali atoms absorb circularly polarized light; any of several similar quantum optical effects

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

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

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

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

The thermionic effect by which electrons are transferred from a hot cathode into a vacuum, in a vacuum tube.