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Why does omit turn to omission and not omition?

Examples of more words acting the same are welcome (I found Submit)

P.S. Is Omission the same as Omitting? (Trying to compare with fit -> fitting)

  • Also intermit – JNF Dec 14 '14 at 13:45
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    Also admitadmission; commitcommission. But these all seem to originate with the Latin verb mittere with various prefixes. – Peter Shor Dec 15 '14 at 4:23
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To omit and omission are words from Latin. Latin verbs developed a lot of irregularities, so the verb o-mitt-ere (infinitive) had the Perfect omisi and the third stem form omiss-us from which omission is derived.

http://www.etymonline.com/index.php?allowed_in_frame=0&search=omission&searchmode=none

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It's a matter of Latin conjugation: the word "mitto" (I send) is the root of a number of such words and the perfect passive participle of mitto was "missum".

See also "remit" -> "remission".

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