There are many interesting events in the history of the English language. Which one of them gave us “defect” (noun, /diːˈfɛkt/, imperfection) and “defect” (verb, /dɪˈfɛkt/ , change allegiances)?

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    Whoops. All my 33 years I've never known there was a distinction in the pronunciation! – Captain Claptrap Dec 2 '10 at 3:26
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    Probably related: initial-stress-derived noun. I do not know if the content is correct or not. – Tsuyoshi Ito Dec 2 '10 at 3:54
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    In other words, to what do you attribute this attribute? – MickeyfAgain_BeforeExitOfSO Dec 2 '10 at 15:13
  • Good one, mickey! – James A. Rosen Dec 2 '10 at 20:25
  • I expanded my previous comment a little and posted it as an answer. Since it does not answer your question directly, feel free to accept another answer if someone post a better-suited answer. – Tsuyoshi Ito Dec 2 '10 at 20:58

(This is an expanded version of my earlier comment on the question.)

This is not the direct answer to your question, but anyway it seems pretty relevant.

In English, there are many two-syllable words which have an accent on the first syllable when used as a noun and on the second syllable when used as a verb, and “defect” is one of them. According to web search, such words seem to be known as “initial-stress-derived nouns.”

Wikipedia gives some explanation for this phenomenon:

In English, since the early modern period,[1] polysyllabic nouns tend to have an unstressed final syllable, while verbs do not. Thus, the stress difference between nouns and verbs applies generally in English, not just to otherwise-identical noun-verb pairs. [2] […] When the stress is moved, the pronunciation, especially of vowels, often changes in other ways as well. Most common is the reduction of a vowel sound to a schwa when it becomes unstressed.

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