duplus

Latin

**Latin numbers ^(edit)**
^{[a], [b]} ← 1	II 2	3 → ^{[a], [b]}
Cardinal: duo Ordinal: secundus, alter Adverbial: bis Multiplier: duplex, duplus Distributive: bīnus Collective: bīniō Fractional: dīmidius, sēmis

Inherited from Proto-Italic *duplos. By surface analysis, duo +‎ -plus.[1] Cf. Ancient Greek διπλόος (diplóos, “double”), from δι- (di-), from δύο (dúo, “two”), + -πλόος (-plóos, “-fold”), and Proto-Germanic *twīflaz (“doubt”).

duplus (feminine dupla, neuter duplum); first/second-declension adjective

First/second-declension adjective.

Case / Gender	Masculine	Feminine	Neuter	Masculine	Feminine	Neuter
Number	Singular			Plural
Nominative	duplus	dupla	duplum	duplī	duplae	dupla
Genitive	duplī	duplae	duplī	duplōrum	duplārum	duplōrum
Dative	duplō	duplae	duplō	duplīs
Accusative	duplum	duplam	duplum	duplōs	duplās	dupla
Ablative	duplō	duplā	duplō	duplīs
Vocative	duple	dupla	duplum	duplī	duplae	dupla

Gallo-Italic:
- Lombard: dopi, dopła
- Piedmontese: dobi
Italo-Dalmatian
- Italian: doppio
- Sicilian: dupru, duplu, dùbulu
Old French: doble (see there for further descendants)
- French: double
- Norman: doubl'ye
- Walloon: dobe
Old Occitan:
- Catalan: doble
- Occitan: doble
Rhaeto-Romance
- Friulian: dopli
- Romansch: dubel, dobel
Sardinian: dopiu
Venetian: dopio, dupio
West Iberian
- Asturian: doble, duble, doblu, dublu
- Old Galician-Portuguese: dobro
  - Galician: dobre
  - Portuguese: dobre, dobro
- Spanish: doble, doblo
→ English: duple, duplo-
→ Italian: duplo
→ Portuguese: duplo
→ Romanian: dublu
→ Spanish: duplo

“duplus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“duplus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
duplus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.

De Vaan, Michiel (2008) “-plus”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 475

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