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Etymology and origin of the English word en-

English has two prefixes spelled en-, and each is also spelled em- before b and p and sometimes before m.[1][2][3] One came through French and the other from Greek, but both go back to the Indo-European word for in.[1][4]

Pronunciation

  • /ɪn/, /ɛn/[5]

en-1 French, forming verbs

Confidence
Established
Formation
Borrowing
Borrowed from
Old French en- via Middle English
Ultimate origin
Proto-Indo-European *en

Etymology

The French prefix is inherited from Middle English en-,[6][3] borrowed from Old French en-,[1][4][2][3][7] the form taken in French by Latin in-, from the preposition in,[1][2][4][3] from Proto-Indo-European *en (“in”).[4] See in-2 for the Latin prefix itself.[1][7]

Earliest recorded meaning

In Old French its main use was to make verbs from nouns and adjectives.[2][6] These verbs and the nouns derived from them were borrowed heavily in Middle English, as in enchant and enchantment.[2][6] Anglo-Norman an- appears in early borrowings such as anoint.[1][2]

Semantic evolution

As a living prefix it dates from the 14th century, according to Hoad.[7] It came to mean putting something into or on something, as in encase and enthrone; bringing something into a state, as in enable and endear; or simply adding emphasis, as in enliven.[7][8][2][4] From the 14th century in- and en- often replaced each other, and nearly every old word with one has at some time been written with the other.[1][4][7] In the 17th century the in- forms were usually preferred.[7] Pairs survive with no difference of sense, as with enclose and inclose, or with one, as with ensure and insure.[7][2][4] The spelling em- was not fully established until the 17th century.[1][7] Some verbs also take the suffix -en, as in enlighten.[1][8][3] In poetry it often just supplied an extra syllable.[1]

Timeline

Meanings

Prefix

  1. Forming verbs from nouns that mean put into or on something: encradle, enthrone.[9][3][1]
  2. Forming verbs from nouns or adjectives that mean cause to be in a certain state: enrich, enslave.[9][3][1]
  3. Forming verbs from nouns that mean provide with or surround with something: empower, enmesh.[9][3]
  4. Added to verbs for emphasis, or to mean thoroughly: entangle, enwrap.[3][1][4]

Word family

en-2 Greek, in

Confidence
Established
Formation
Borrowing
Borrowed from
Ancient Greek ἐν-
Ultimate origin
Proto-Indo-European *en

Etymology

The Greek prefix is borrowed from Ancient Greek ἐν- (en-), from ἐν (en, “in”),[1][2][3][7] from Proto-Indo-European *en (“in”),[4] the same Indo-European base as the preposition in.[1][4] It came partly through Latin en-.[3][9]

Semantic evolution

It appears chiefly in compounds already formed in Greek, such as endemic, energy and enthusiasm, and only occasionally in modern ones, such as enderon.[1][2][8]

Meanings

Prefix

  1. In words of Greek origin, meaning in or within: endemic, enzootic.[9][3][2]

Word family

Usage notes

It is usually unstressed, and is pronounced either /ɪn/ or /en/.[10]

References

  1. ^ a b c d e f g h i j k l m n o p q r s t u Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  2. ^ a b c d e f g h i j k Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  3. ^ a b c d e f g h i j k l Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  4. ^ a b c d e f g h i j Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  5. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  6. ^ a b c Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
  7. ^ a b c d e f g h i j k Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  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. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins
  10. ^ Jones, Daniel (2011), Cambridge English Pronouncing Dictionary, 18th ed., ed. Peter Roach, Jane Setter and John Esling, Cambridge: Cambridge University Press

Related etymologies

Cite this entry

“En-.” Etymologically, 6 Nov. 2026, etymologically.com/en/en-. Accessed 6 Nov. 2026.

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