Pretty simple question, I think. Where does the "i" in "repair" go when spelling "reparable" or "irreparable" ? Is this just a "color"/"colour" type situation, or some deeper conspiracy?


Both words were borrowed from Latin via French.

The Latin verb is reparare. In modern French, it is spelled réparer; in Old French, when it was borrowed by English, it was reparer. The English word is first attested in the 14th century. Early forms in English were repare, repayre, repeire, repeyre, and repaire, probably because those all sounded very similar, at least in some periods.

As to why English eventually chose repair as its standard form, I don't think we know; it just "happened".

The word irreparable was also borrowed from Latin (in-/irreparabilis), via French irreparable, the French word first attested in the 12th century, the English in the 16th. It was sometimes also spelled irreperable in English, which probably also sounded similar.

As to why the ai spelling never occurred, we don't know. Perhaps it was because it is a long vowel, which is less likely to occur in unstressed syllables like par in irreparable, as opposed to stressed pair in repair.

Another hypothesis (of mine) is that in English the verb was confused with and fused with English repair "retire", from Latin repatriare ("return to one's fatherland"), via French repairer, which is semantically close and phonetically very similar, if not identical. Another, common word that pressures one into this direction is pair.

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  • Related comment from a language-nerd friend of mine I just spoke with: "To repair in French is réparer. Irreparable is irréparable. Def borrowed from French, just without the accents" – elCrash Feb 28 '17 at 22:40
  • I won't give this as an answer because I don't know if it's the answer, but if you check Wiktionary's etymology you will see that "repair" has two separate etymologies: one from French "reparer", as mentioned, with the meaning we're probably all thinking of, and one from French "repairer", this time with an <i>, with a meaning similar to "retreat". I find it quite plausible that due to the similar or identical pronunciation of these words in English, the spelling eventually merged. – LjL Feb 28 '17 at 23:14
  • @LjL: Ah, I was just writing that! – Cerberus_Reinstate_Monica Feb 28 '17 at 23:29

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