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English pronunciation / spelling guides appear to state that the letter/grapheme "a" is pronounced either as the "short a" with IPA symbol /æ/, as in "mat" or the "long a" with IPA symbol /eɪ/, as in "baby."

However, apparently there exist multiple words where all references I checked provide the spelling of "short e" with IPA symbol /e/ or /ɛ/ which I take as a variation in the IPA transcription not in the underlying pronunciation.

What I'm unable to come up with or find a reference for is when will the grapheme "a" be pronounced as /e/ (or /ɛ/) instead of the short "a" /æ/ that the typical rules would predict?

Examples of words that have "a" transcribed as /e/: - temporary - nefarious - compare - share - dare - subsidiary (many more have two alternative pronunciations listed, one with /æ/ and one with /e/)

I recognize that all these examples include the sequence "ar" but I do not know if this is only because I was searching for this sequence in a corpus (based on the original example of "nefarious") or because there exist no other cases.

Actually, I find that my most trusted reference "The ABC's and all their tricks" by Margaret M. Bishop is including some of these words in the group of "-arr-" as in "carry", which my dictionaries transcribe as /ˈkæri/. This mixes two different pronunciations under the same rule. Is there no "rule" to help predicting the /æ/ or /e/ realization?

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Trying to find consistency between English graphemes and phonemes is an exercise in futility, and quite likely to make you lose your hair. There is a tendency for the phoneme /a/ to be raised to [ɛ] or diphthongised to something like [ɛɐ] before /r/ in stressed syllables in monosyllables and in front of a higher vowel. But it’s only a tendency, and it’s in no way consistent (e.g., ‘sparse’ and ‘scarce’). And of course different speakers of different dialects do this to different degrees. I have [æ] in ‘nefarious’ and [ə] or [ɐ] in ‘subsidiary’, for example. – Janus Bahs Jacquet Dec 2 '13 at 15:09
Thank you. My real purpose is memorizing the pronunciation of words as given in a dictionary but my brain is breaking down at this level of distinction. Likely I should not bother as I'm not able to consistently reproduce the specific phonemes anyways. And if there is that level of variation between native speakers then it should not matter. – nefarious Dec 2 '13 at 15:28
You seem to be using both British and American dictionaries. These two dialects have completely different rules for pronunciation of vowels before 'r' (and note that it varies between different American dialects, and between different British dialects). – Peter Shor Dec 2 '13 at 15:44
It would be easier if you settled on one dialect; everybody understands most dialects, and it will help your consistency. If you decide on American English, there is a very good English pronouncing dictionary -- Kenyon and Knott -- that only gives the spelling and the phonemic pronunciation. It's very short. Here's a sample of the system. – John Lawler Dec 2 '13 at 15:55
@nefarious, it does not matter whether you pronounce your name here as [nəˈfæɹiəs] or [nəˈfɛ(ə)ɹiəs]: both sound natural and are common. Pronouncing ‘share’ and ‘dare’ as [ʃ/dæɹ] (AmE) or [ʃ/dæː] (BrE), however, would probably be noticed, because the raising in those words is, as far as I know, more or less universal in all dialects: they are uniformly [ʃɛɹ] and [dɛː], respectively. – Janus Bahs Jacquet Dec 2 '13 at 15:55

Except for words imported from non-Latin/Germanic languages, words with ortography matching the following regular expression will have the matching part realized as /er/: *a[ei]r[iey]* provided that the matching syllable has the word-stress.

In the "Shorter Oxford English Dictionary" (BrE pronunciations) the expression matches over 450 headwords (including false positives where "a" is not in a stressed syllable) with only a couple exceptions, like "Bohairic" (via Arabian), "dairi" (via Japanese), "etaerio" (From Greek via French; exception to the non-Latin precondition). In the cases that I investigated Merriam-Webster's Collegiate was also providing the phoneme /e/ for the syllable that includes the letter "a".

It appears that if the consonant was not "r" then the realization would be most often /ei/ (as in "tale", "calix", "agave" (BrE), "baby","navy", "zamia") but the "r" reduces that to the less heavy /e/. The rise is likely related to the stressed syllable being open.

There exist other examples, with all requiring that the 'a' be in a stressed syllable but there appear to be more exceptions than matches in the cases that I investigated ("scarus", "marum", "larum", "garum", --> /e/ but most other matches are a false positive).

This observation mostly matches the first comment of Janus Bahs Jacquet but strengthens the conditions for the raise to happen. Will be glad to revise if someone is able to provide a condition that provides a higher accuracy.

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‘Agave’ is troublesome—it is either /əˈɡeɪv(i)/ or /əˈɡɑːv/ (the former mostly found in BrE). – Janus Bahs Jacquet Feb 3 '14 at 23:22
As always, you are right. For the search I had to use my "Shorter Oxford English Dictionary" (SOED) as neither of my other dictionaries did support large-scale regex search. Unforunately, SOED includes only BrE pronunciations. This also means that all the stats are for BrE though I did a couple of random checks against Merriam Webster's Collegiate (for the a[ei]r[iey] regexp hits). – nefarious Feb 4 '14 at 3:03

All your examples have latin roots. Wary is a germanic root word with a similar pronunciation. Scary is from Old Norse. Wary is rather interesting - the a is pronounced the same in wary and in beware. But in ward and warn it changes to rhyme with sword and sworn. It almost feels like this has 'stolen' that sound for w, so word and worry match with turd and third.

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