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1Mathematics The joining of two sets which without overlapping jointly constitute a larger set, or the relation between two such sets.
‘Now we have the notion of an adjunction, along with its unit and counit.’
‘The last piece of this puzzle is the notion of an adjunction.’
‘It is worth stressing in Fry's argument the spontaneous adjunction of beauty and consolation, since that throws a certain light on the Dadaists' refusal of beauty: why should they console the war-makers?’
‘The problem of de Groot concerned compactifications of spaces by means of an adjunction of a set of minimal dimension.’
‘According to this account, a morphologically simplex reflexive (being an X° category) can move into another X° position (such as Infl) by adjunction.’
‘The adjunction of the negation of such a sentence to the axioms of the system yields a consistent extension of formalized classical mathematics in which an actually false proposition [ein inhaltlich falscher Satz] is derivable.’
2Logic The asserting in a single formula of two previously asserted formulae.
Origin
Late 16th century: from Latin adjunctio(n)-, from the verb adjungere (see adjoin).