From Middle English preventen, from Latin praeventus, perfect passive participle of praeveniō, from prae + veniō.

• IPA: /pɹɪˈvɛnt/
• (weak vowel) IPA: /pɹəˈvɛnt/

prevent (prevents, present participle preventing; simple past and past participle prevented)

1. (transitive) To stop (an outcome); to keep from (doing something). [from 16th c.]

   I brush my teeth regularly to prevent tooth decay.

2. (intransitive, now, rare) To take preventative measures. [from 16th c.]
   • 1897 October 16, Henry James, What Maisie Knew, Chicago, Ill., New York, N.Y.: Herbert S. Stone & Co., →OCLC ↗:

     I think you must be mad, and she shall not have a glimpse of it while I'm here to prevent!

3. (obsolete, transitive) To come before; to precede. [16th]
   • 1549 March 7, Thomas Cranmer [et al.], compilers, The Booke of the Common Prayer and Administration of the Sacramentes, […], London: […] Edowardi Whitchurche […], →OCLC ↗:

     We pray thee that thy grace may always prevent and follow us.

   • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC ↗, 1 Thessalonians 4:15 ↗:

     We which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.

   • 1718, Mat[thew] Prior, “Solomon on the Vanity of the World. A Poem in Three Books.”, in Poems on Several Occasions, London: […] Jacob Tonson […], and John Barber […], →OCLC ↗, book II (Pleasure), page 448 ↗:

     Then had I come, preventing Sheba's Queen, / To ſee the comelieſt of the Sons of Men; […]

4. (obsolete, transitive) To outdo, surpass. [16th]
   • 1596, Edmund Spenser, “Book IV, Canto I”, in The Faerie Queene. […], part II (books IV–VI), London: […] [Richard Field] for William Ponsonby, →OCLC ↗:

     With that he put his spurres vnto his steed, / With speare in rest, and toward him did fare, / Like shaft out of a bow preuenting speed.

5. (obsolete, transitive) To be beforehand with; to anticipate.
   • c. 1699 – 1703, Alexander Pope, “The First Book of Statius His Thebais”, in The Works of Mr. Alexander Pope, volume I, London: […] W[illiam] Bowyer, for Bernard Lintot, […], published 1717, →OCLC ↗:

     their ready guilt preventing thy commands

• See also Thesaurus:hinder

• French: empêcher
• German: verhindern, vorbeugen, etwas daran hindern (zu geschehen)
• Italian: impedire, prevenire
• Portuguese: impedir, prevenir
• Russian: предотвраща́ть
• Spanish: impedir, prevenir