(physics) a factor arising frequently in special relativity, to calculate the degree of time dilation, length contraction and relativistic mass of an object moving relative to an observer, defined as (1-v²/c²)^(-0.5), where v and c are relative velocity and the speed of light, respectively

The collective feeling of well-being (or otherwise) of an electorate, a high one supposedly favouring the incumbent party in an election.

(idiomatic, archaic, vulgar) having a fat, sleek face.

Alternative form of in-your-face

(idiomatic) An exclamation of derision and contempt.

(informal) aggressively or blatantly confrontational

An indication of how long a sunscreen remains effective when applied to the skin.

Retroactive. / (law) Formulated or enacted after some event, and then retroactively applied to it.

(aviation) Initialism of Federal Aviation Administration (agency regulating U.S. aviation). / (law) Initialism of Federal Arbitration Act (9 USC 1).

(law) in fact; by the act or fact