inter-

Etymology

It is inherited from Middle English inter-, also entre- and enter-,^[2][3] borrowed from Old French entre- and directly borrowed from Latin inter-,^[4][5][2][6] the combining form of inter (“between, among”),^[4][7][5] from Proto-Indo-European *enter (“between, among”), a comparative of *en (“in”).^[7][5] It is cognate with Old Irish eter and Ancient Greek ἔντερα (éntera, “intestines”),^[7][5] and Etymonline and Weekley relate it to under.^[7][8] In Latin the spelling shifted to intel- before l, hence intelligence.^[7]

Earliest recorded meaning

Latin joined inter to verbs, adjectives and nouns, as in intercēdō, intervallum and interregnum, and it had senses of between, at intervals, and preventing, as in intercipiō.^[4][6] The first English words came through French with entre- or enter-, such as entrechange and enterfere, and Middle English formed new compounds on them.^[4][6][5]

Semantic evolution

Between the 15th and 17th centuries entre- and enter- gave way to inter-, and only entertain and enterprise keep the older form.^[4][6][7] English often received both a simple word and its compound, as with change and interchange, or view and interview.^[4][5] From such pairs inter- became a living prefix, in the 15th century according to Etymonline and Barnhart.^[4][7][5] It was used on verbs, nouns and adjectives, including native ones, as in intertwine.^[4][7] Meanwhile it acquired the sense of mutual or reciprocal, as in intermarriage.^[6] The other large group is that in which it governs the noun as a preposition would, as in international and intercollegiate.^[6][4] The later inter-college and interisland are on this pattern too.^[4][5]

Timeline

• c. 1374 – interchange.^[4]
• 15th century – a living prefix in English.^[7][5]
• 1514 – interview.^[4]
• 1641 – intertwine.^[4]
• 1750 – interact.^[4]
• 1780 – international.^[4]

Meanings

Prefix

1. Added to mean between or among: intercontinental, interpose.^[9][2][5]
2. Added to mean mutual, reciprocal or together: interdependent, intermesh.^[9][2][5]
3. Added to mean carried on between or shared by several: intercollegiate, interfaith.^[2][6]
4. Added to mean occurring between things or at intervals: interglacial, intermit.^[2][6]

Word family

• intermediary
• intermediate
• international
• interact
• interaction
• interactive
• interfere
• interrupt
• interval
• intervene
• interview

Related words

• intra-
• enter-
• under
• in-

Usage notes

It normally has primary or secondary stress on its first syllable, with front stress common on nouns such as intercom.^[10]

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
3. ^ 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)
4. ^ a b c d e f g h i j k l m n o Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
5. ^ a b c d e f g h i j k Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
6. ^ a b c d e f g h Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
7. ^ a b c d e f g h i Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
8. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
9. ^ a b 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