adjoin

English

Etymology

From Anglo-Norman adjoindre, from Latin adiungō.

Pronunciation

Verb

adjoin (third-person singular simple present adjoins, present participle adjoining, simple past and past participle adjoined)

  1. (ambitransitive) To share a common boundary or border with; to be physically contiguous to (a piece of land or property).
    The living room and dining room adjoin each other.
    It's at this point that these three neighbourhoods adjoin.
    • 1811, [Jane Austen], chapter XI, in Sense and Sensibility […], volume II, London: […] C[harles] Roworth, […], and published by T[homas] Egerton, […], →OCLC:
      ' […] The land was so very desirable for me in every respect, so immediately adjoining my own property, that I felt it my duty to buy it. […] '
    • 2013, Graeme Simsion, The Rosie Project, →ISBN, page 55:
      We were in the living area, which adjoins the kitchen.
  2. (transitive, mathematics, chiefly algebra and number theory) To extend an algebraic object (e.g. a field, a ring, etc.) by adding to it an element not belonging to it and then ensuring closure, for example by also adding all finite power series of the element.
    The ring adjunction ℚ[2] can be obtained from ℚ by adjoining 2 to ℚ.
    The field adjunction ℚ(π) can be obtained from ℚ by adjoining π to ℚ.

Derived terms

Translations

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