Etymologically

firm

Etymology and origin of the English word firm

English has two words spelled firm: the adjective “fixed, solid”, from Latin firmus, and the noun “business”, which comes from the same Latin word by way of Italian or Spanish firma “signature”.[1][2][3]

Pronunciation

  • IPA: UK /fɜːm/, US /fɝːm/[4]

firm1 solid

Confidence
Established
Formation
Borrowing
First attested
c. 1374
Borrowed from
Old French ferme via Middle English
Ultimate origin
Latin (firmus)

Etymology

The adjective is inherited from Middle English ferm,[5][1] borrowed from Old French ferme (“strong, steadfast”),[5][1] from Latin firmus (“strong, stable”),[5][1] from a suffixed form of Proto-Indo-European *dher- (“to hold firmly, support”).[5][1] The spelling with -i- was restored after Latin in the late 16th century.[5][2] The verb, Middle English fermen, is from Old French fermer or directly from Latin firmāre (“to make firm”).[5][1] Barnhart compares Latin frētus “relying on” and Greek thrónos “seat”, as does Merriam-Webster.[1][6] Latin firmus is also the source of farm.[3]

Earliest recorded meaning

Of agreements and decrees, “fixed, settled”, and of persons, “steadfast”: about 1374.[7] Etymonline dates the adjective to the late 14th century,[5] Barnhart to about 1378, in Piers Plowman.[1] The verb, “to make firm, establish”, is from 1303.[1][7]

Semantic evolution

Senses of steadfastness and of things settled came first; the physical senses are recorded later in the OED, “not shaking” from 1593, “securely fixed” from 1597 and “of solid texture, not yielding” from 1611.[7] Hoad dates “fixed, immovable” to the 14th century and “stable, not yielding” to the 15th.[2] “Healthy, robust”, as in infirm, is from 1577 and probably obsolete.[7] The intransitive verb, “to become firm”, is from 1879, and firm up from 1956.[5] Of prices and markets, the verb means to recover or steady.[8]

Timeline

  • 1303 – verb, to establish.[1][7]
  • c. 1374 – adjective, fixed, settled.[7]
  • 1377 – of a person, steadfast.[7]
  • late 16th century – spelling firm.[5]
  • 1611 – of solid texture.[7]
  • 1879 – verb, to become firm.[5]
  • 1956 – firm up.[5]

Modern meaning

Adjective

  1. Solid; not yielding to pressure.
  2. Securely fixed in place; stable.
  3. Showing determination; resolute.
  4. Fixed and definite: a firm offer.
  5. Steady in value: firm prices.

Verb

  1. To make or become firm, often with up.
  2. To recover from a decline in price.

Adverb

  1. Firmly, resolutely: stand firm.

Word family

  • firmly
  • firmness
  • firm up

firm2 business

Confidence
Established
Formation
Borrowing
First attested
1574
Borrowed from
Italian firma
Ultimate origin
Latin (firmus)

Etymology

The business is borrowed from Italian firma (“signature”) or Spanish firma,[2][9][6] from Medieval Latin firma,[2] from Latin firmāre (“to make firm”), in Late Latin “to confirm by signature”,[5][2] from firmus (“strong, stable”).[5][1] Barnhart traces the business sense to German Firma (“a business, name of a business”), from Italian firma.[1][5]

Earliest recorded meaning

A signature: 1574, now obsolete.[7][6]

Semantic evolution

From a signature the word came to mean the name or style under which a business is carried on, from the mid-18th century,[3][2] and then the business itself.[3] A partnership carrying on a business is recorded in 1744.[7][1] Sarcastic use of a group of people seen as associated is from before 1797.[7] A long firm is a group of swindlers who obtain goods on credit and never pay, from 1869.[7]

Timeline

  • 1574 – a signature.[7][6]
  • 1744 – a business partnership.[7][1]
  • 1869 – long firm.[7]

Modern meaning

Noun

  1. A business or company, especially a partnership of two or more people.
  2. (British slang) A gang of criminals.
  • farm
  • throne
  • affirm
  • confirm
  • infirmary

Usage notes

In Lincolnshire, Sussex and Somerset dialect a firm was a bench or form.[10]

References

  1. ^ a b c d e f g h i j k l m n Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  2. ^ a b c d e f g Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  3. ^ a b c d Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
  4. ^ Jones, Daniel (2011), Cambridge English Pronouncing Dictionary, 18th ed., ed. Peter Roach, Jane Setter and John Esling, Cambridge: Cambridge University Press
  5. ^ a b c d e f g h i j k l m n Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  7. ^ a b c d e f g h i j k l m n o Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
  8. ^ Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
  9. ^ Pearsall, Judy, ed. (1998), The New Oxford Dictionary of English, Oxford: Clarendon Press
  10. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)

Related etymologies

Cite this entry

“Firm.” Etymologically, 15 Oct. 2026, etymologically.com/en/firm. Accessed 15 Oct. 2026.

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