Etymologically

firmus

Etymology and origin of the Latin word firmus

Confidence
Probable
Formation
Inherited
First attested
Plautus
Inherited from
Proto-Italic *fermo-
Ultimate origin
Proto-Indo-European (*dʰer-)
Etymology tree
inherited borrowed derived
Latin firmus
Latin firmo

Pronunciation

  • IPA (Classical): [ˈfɪr.mʊs][1]
  • IPA (Ecclesiastical): [ˈfir.mus][1]

Forms

firmus (feminine firma, neuter firmum, comparative firmior, superlative firmissimus, adverb firmiter); first/second-declension adjective[1]

Etymology

It is inherited from Proto-Italic *fermo-, inherited from Proto-Indo-European *dʰer-mo- (“holding”), from the root Proto-Indo-European *dʰer- (“to hold”).[2] The /i/ may come from /e/ raised after the labial.[2] Cognate with Sanskrit धर्मन् (dhárman-, “support, law”), Avestan dar- (“to hold”) and Lithuanian darýti (“to do”).[2][3] Georges thought it might be related to ferē and frētus.[4]

Earliest recorded meaning

Plautus uses it.[2] Köbler dates Plautus c. 250–184 BC.[5]

Semantic evolution

In Classical Latin it was firm and strong of things, sound, steady of the hand or footing, well protected of fortifications, and substantial of food or full-bodied of wine.[3] Caesar uses it of strong branches and Livy of ground firm enough to hold temples.[6] Of persons it meant steadfast, constant and reliable.[7][1] Döderlein contrasts it with validus, strong in the active sense.[8]

In medieval Latin it was strong, solid, healthy, fledged of birds, and steadfast.[9][10] It survives as Italian fermo, French ferme, Spanish firme and Romanian ferm.[1] English firm and farm come from it and its derivatives.[11]

Timeline

  • c. 250–184 BC – Plautus uses it.[2][5]
  • 116–27 BC – Varro calls Apulian wool more durable (firmior).[3][5]
  • c. 1300 – English farm is recorded as “fixed rent”, from Medieval Latin firma “fixed payment”.[11]
  • late 14th century – English firm “strong, steady” is recorded.[11]

Meanings

Adjective

  1. Strong, stout, durable.[3][7]
  2. Sound, in good condition; steady (of the hand or footing).[3]
  3. Strongly protected, secure.[3]
  4. Substantial (of food); full-bodied (of wine).[3]
  5. Steadfast, constant, reliable.[7][1]
  6. (Medieval Latin) Healthy; fledged (of birds).[10]

Word family

  • firmitās
  • firmitūdō
  • firmō
  • īnfirmus
  • firmāmen
  • firmāmentum
  • firmātor
  • firmē
  • firmiter

References

  1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  3. ^ a b c d e f g Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  4. ^ Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  5. ^ a b c Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ a b c Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  8. ^ Döderlein, Ludwig (1874), Döderlein’s Hand-book of Latin Synonymes, tr. H. H. Arnold, Andover: W. F. Draper
  9. ^ Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
  10. ^ a b Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  11. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com

Derived terms

Related etymologies

  • opus · also from Proto-Indo-European
  • albus · also from Proto-Indo-European
  • potis · also from Proto-Indo-European
  • salvus · also from Proto-Indo-European
  • socius · also from Proto-Indo-European
  • signum · also from Proto-Indo-European
  • frater · also from Proto-Indo-European
  • foedus · also from Proto-Indo-European
Cite this entry

“Firmus.” Etymologically, 16 Oct. 2026, etymologically.com/la/firmus. Accessed 16 Oct. 2026.

Last edited on . ·