The title of a princess. / (rare) A female given name from English.

plural of princess consort

The wife of a sovereign prince.

plural of principal investigator

(sciences) lead researcher on a grant-funded project

(psychology, psychoanalysis, Freudianism, often hyphenated when used attributively) The principle that human decisions and behavior are strongly motivated by the instinctual desire of the id, arising in infancy, to experience pleasure and avoid pain.

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

(psychology, psychoanalysis, Freudianism, often hyphenated when used attributively) The mental mechanism which guides a person, as he or she matures, in adapting to and coping with the real, external world, by suppressing or deferring the childish gratification-seeking desires of the id.

(ethics, philosophy) The ethical principle asserting that initiating physical force against persons or their justly acquired property, or threatening to do so, is illegitimate.

plural of pillow princess