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Etymology and origin of the English word decode

Confidence
Established
Formation
Derivation
First attested
1896 North British Daily Mail More words from the 19th century
Ultimate origin
Latin codex
Etymology tree
inherited borrowed derived
English code
English decode
From the same root
English encode ← code

Pronunciation

  • UK: /dɪˈkəʊd/, /diːˈkəʊd/[1]

Etymology

It is formed from English de- + code,[2][3][4][5][6][7] from the noun or the verb.[2][4][8] Weekley regarded it as coined on the model of decipher.[9] The noun had meant a cipher or system of signals since 1808, and goes back through Old French code (“system of laws, law-book”) to Latin codex (“systematic classification of statutory law”).[3]

Earliest recorded meaning

To decipher a coded message: 1896, in the North British Daily Mail: "The message was decoded."[2] Etymonline and Barnhart give the same year,[3][4] and Dictionary.com 1895–1900.[6]

Semantic evolution

The OED's entry already covers absolute and transferred uses of deciphering.[2] Its opposite encode came later, in 1917 according to Etymonline and 1919 according to the OED,[3][2] and decoder is recorded from 1920.[2] With radio, recording and computing the verb was extended to analysing a coded audio or electronic signal,[8][7] as when an amplifier decodes surround-sound signals,[7] and to converting coded characters from one form into another.[10] Merriam-Webster Unabridged and Collins also use it for working out the parts and meaning of a message in ordinary language, or of words and phrases in a foreign language.[7][10] Merriam-Webster Unabridged also lists a noun decode, a secret message in decoded form.[7]

Timeline

  • 1896 – to decipher or translate a coded message.[2][3][4][7]

Meanings

Verb

  1. To convert a message from code into ordinary language; to decipher: The spy decoded the telegram by candlelight.[7][10][2]
  2. To recognise and interpret an electronic signal, converting it into a usable form.[7][10][8]
  3. (computing) To convert coded characters or data from one form into another.[10]
  4. To work out the meaning of words, phrases or signs, especially in a foreign language.[10][7]

Noun

  1. A secret message in decoded form.[7]

Word family

  • decoder
  • codec

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  5. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  6. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  7. ^ a b c d e f g h i j Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  8. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  9. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
  10. ^ a b c d e f Collins English Dictionary (2023), Glasgow: HarperCollins
Cite this entry

“Decode.” Etymologically, 8 Nov. 2026, etymologically.com/en/decode. Accessed 9 Nov. 2026.

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