fourfold

EnglishEdit

English numbers (edit)
40
[a], [b] ←  3 4 5  → [a], [b]
    Cardinal: four
    Ordinal: fourth
    Multiplier: quadruple, fourfold
    Distributive: quadruply
    Fractional: quarter, fourth

EtymologyEdit

From Middle English fourfold, fourefold, from Old English fēowerfeald. Equivalent to four +‎ -fold. Cognate with Dutch viervoud, Gothic 𐍆𐌹𐌳𐌿𐍂𐍆𐌰𐌻𐌸𐍃 (fidurfalþs).

AdjectiveEdit

fourfold (not comparable)

  1. Four times as great; quadruple.
  2. Comprised of four individual members.

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AdverbEdit

fourfold (not comparable)

  1. by a factor of four

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VerbEdit

fourfold (third-person singular simple present fourfolds, present participle fourfolding, simple past and past participle fourfolded)

  1. to increase to four times as much; to multiply by four

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NounEdit

fourfold (plural fourfolds)

  1. (mathematics) An algebraic variety of degree 4.
    • 2015, Brent Pym, “Elliptic singularities on log symplectic manifolds and Feigin--Odesskii Poisson brackets”, in arXiv[1]:
      Our main application is to the classification of Poisson brackets on Fano fourfolds.