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Completed vs Proven - What's the difference?

completed | proven |

As verbs the difference between completed and proven

is that completed is past tense of complete while proven is past participle of lang=en.

As adjectives the difference between completed and proven

is that completed is finished while proven is having been proved; having proved its value or truth.

completed

English

Verb

(head)
  • (complete)
    • Aldrichimica Acta Volume 30 No 4] (pdf) from [http://www.sigmaaldrich.com/chemistry/chemical-synthesis/learning-center/aldrichimica-acta.html Sigma-Aldrich
  • :: He completed his B.Sc. (Hons.) degree at the University of New South Wales in 1958 and went on to the Victoria University of Manchester where his studies on the fungal pigment phomazarin led to the award of a Ph.D. in 1963 under the supervision of (the late) Professor Arthur J. Birch.

    • Adjective

    (en adjective)
  • finished

    • proven

    English

    Adjective

    (en adjective)
  • Having been proved; having proved its value or truth.
    • It's a proven fact that morphine is a more effective painkiller than acetaminophen is.
    Mass lexical comparison is not a proven method for demonstrating relationships between languages.

    Antonyms

    * (having been proved) unproven

    Verb

    (head)

    • Usage notes

    As the past participle of prove, proven is often discouraged, with proved preferred – “have proved” rather than “have proven”. However, today in everyday use they are both used, about equally. Historically, proved'' is the older form, while proven''' arose as a Scottish variant – see . Used in legal writing from mid 17th century, it entered literary usage more slowly, only becoming significant in the 19th century, with the poet among the earliest frequent users (presumably for reasons of meter). In the 19th century, '''proven was widely discouraged, and remained significantly less common through the mid 20th century (''proved being used approximately four times as often), by the late 20th century it came to be used about equally. As an attributive adjective, proven is much more commonly used, and proved is widely considered an error – “a proven method”, not *“a proved method”.

    References

    * English adjectives ending in -en English irregular past participles ----