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Lodgings to Let, an 1814 engraving featuring a double entendre. He: "My sweet honey, I hope you are to be let with the Lodgins!" She: "No, sir, I am to be let alone".. A double entendre [note 1] (plural double entendres) is a figure of speech or a particular way of wording that is devised to have a double meaning, one of which is typically obvious, and the other often conveys a message that ...
Dual county, a Gaelic games county which competes in both Gaelic football and hurling; Dual diagnosis, a psychiatric diagnosis of co-occurrence of substance abuse and a mental problem; Dual fertilization, simultaneous application of a P-type and N-type fertilizer; Dual impedance, electrical circuits that are the dual of each other
Dual (category theory), a formalization of mathematical duality; Duality (optimization) Duality (order theory), a concept regarding binary relations; Duality (projective geometry), general principle of projective geometry; Duality principle (Boolean algebra), the extension of order-theoretic duality to Boolean algebras; S-duality (homotopy theory)
Dual (abbreviated DU) is a grammatical number that some languages use in addition to singular and plural.When a noun or pronoun appears in dual form, it is interpreted as referring to precisely two of the entities (objects or persons) identified by the noun or pronoun acting as a single unit or in unison.
Nondualism includes a number of philosophical and spiritual traditions that emphasize the absence of fundamental duality or separation in existence. [1] This viewpoint questions the boundaries conventionally imposed between self and other, mind and body, observer and observed, [2] and other dichotomies that shape our perception of reality.
In the mental health field, a dual relationship is a situation where multiple roles exist between a therapist, or other mental health practitioner, and a client. [1] Dual relationships are also referred to as multiple relationships , and these two terms are used interchangeably in the research literature.
In linguistics, double articulation, duality of patterning, or duality [1] is the fundamental language phenomenon consisting of the use of combinations of a small number of meaningless elements (sounds, that is, phonemes) to produce a large number of meaningful elements (words, actually morphemes). [1]
In mathematics, a duality, generally speaking, translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one-to-one fashion, often (but not always) by means of an involution operation: if the dual of A is B, then the dual of B is A. Alexander duality; Alvis–Curtis duality; Artin–Verdier duality