fourfold

English
English numbers (edit)
40
 ←  3 4 5  → 
    Cardinal: four
    Ordinal: fourth
    Latinate ordinal: quartary, quaternary
    Reverse order ordinal: fourth to last, fourth from last, last but three
    Latinate reverse order ordinal: preantepenultimate
    Adverbial: four times
    Multiplier: fourfold
    Latinate multiplier: quadruple
    Distributive: quadruply
    Group collective: foursome
    Multipart collective: quadruplet
    Greek or Latinate collective: tetrad
    Greek collective prefix: tetra-, tessera-
    Latinate collective prefix: quadri-
    Fractional: quarter, fourth
    Latinate fractional prefix: quadrant-
    Elemental: quadruplet
    Greek prefix: tetarto-
    Number of musicians: quartet
    Number of years: quadrennium, olympiad

Alternative forms

Etymology

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

Adjective

fourfold (not comparable)

  1. Four times as great; quadruple.
  2. Comprised of four individual members.
    • 1895, [Charles Hardy], The Aural System […]‎, page 5:
      Most pupils have a fourfold object in studying a language; they wish to be able to read and write, to speak and to understand it.

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Adverb

fourfold (not comparable)

  1. By a factor of four.

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Verb

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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Noun

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:
      Our main application is to the classification of Poisson brackets on Fano fourfolds.
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