fourfold

English

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

Synonyms

• quadruple, quadruplicate

Translations

four times as great

• Bulgarian: четворен (četvoren)
• Czech: čtyřnásobný (cs)
• Finnish: nelinkertainen
• Galician: catro veces, cuádruple (gl)
• (deprecated template usage) {{trans-mid}}
• Latin: quadruplex (la)
• Plautdietsch: feafach
• Tagalog: makaapat
• Telugu: నాలుగింతలు (te) (nālugintalu)

Adverb

fourfold (not comparable)

1. by a factor of four
   • Bible, 2. Sam. xii. 6

     He shall restore the lamb fourfold.

Synonyms

• quadruply; see also Thesaurus:four times

Translations

by a factor of four

• Bulgarian: четирикратно (bg) (četirikratno), четворно (bg) (četvorno)
• Czech: čtyřnásobně
• (deprecated template usage) {{trans-mid}}
• Finnish: nelinkertaisesti

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

Synonyms

• quadruple, quadruplicate

Translations

increase to four times as much

• Catalan: quadruplicar (ca)
• Dutch: verviervoudigen
• Finnish: nelinkertaistaa
• French: quadrupler (fr)
• German: vervierfachen (de), vierfachen (de)
• Hindi: चौगुना करना (caugunā karnā)
• (deprecated template usage) {{trans-mid}}
• Italian: quadruplicare (it)
• Portuguese: quadruplicar (pt)
• Russian: учетверять (ru) (učetverjatʹ)
• Spanish: cuadruplicar (es)
• Swedish: fyrdubbla (sv), fyrfaldiga (sv)

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^[1]:

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