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Is the word formulæ, written with an æ at the end, valid in English? I stumbled upon this apparently plural form of formula in the Wiktionary.

I had no idea the letter æ could occur in English. Does anyone know the story to this? Are there other examples of English words that contain letters not found in the standard English alphabet?

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Related: english.stackexchange.com/questions/9004/… –  z7sg Ѫ Sep 9 '11 at 23:00
    
Related: english.stackexchange.com/questions/2554/… –  z7sg Ѫ Sep 9 '11 at 23:00
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Æ is not a letter, it is a ligature formed from a and e. –  z7sg Ѫ Sep 9 '11 at 23:01
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You might just as well include café and résumé. Just because we say they use letter "e" with an accent, doesn't alter the fact that these are words that don't use the standard English alphabet. In fact, here's a list of words that may be written with a ligature, and doubtless there's a list of "accented" forms somewhere. @Neil is correct that it's (sometimes) a matter of preference (if you have a suitable character set), but I personally would prefer not to see or use them. –  FumbleFingers Sep 9 '11 at 23:18
    
@codebolt If you’re still around, I’ve provided you a new answer below to shed additional light on your second question, which no one had yet answered. –  tchrist Sep 2 '12 at 17:58

3 Answers 3

up vote 7 down vote accepted

It’s not really part of Modern English vocabulary. Depends how you define vocabulary. Does it include words and letters being used? Or does it cover only those words and letters that are officially in words such as a or apple?

Wikipedia says this about it:

Æ (miniscule: æ) is a grapheme formed from the letters a and e. Originally a ligature representing a Latin diphthong, it has been promoted to the full status of a letter in the alphabets of some languages, including Danish, Faroese, Norwegian, and Icelandic. As a letter of the Old English Latin alphabet, it was called æsc (“ash tree”) after the Anglo-Saxon futhorc rune , which it transliterated; its traditional name in English is still ash /æʃ/.

It’s not a letter in the English alphabet. So depending on how you define vocabulary, Æ either could be or is not part of English.

Another strange letter would be œ, which used to be in the word diarrhoea when written as diarrhœa.

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Latin diphthongs in English are gradually falling out of use (more quickly in the US then in the UK). For example: Hardly anyone spells oeconomics any more. –  GEdgar Sep 10 '11 at 2:27
    
As a British English speaker, they're not really falling out of use here (with exceptions such as an initial œ in words like œconomics or œcumenical). Whereas US English has almost completely discarded æ and œ in favour of just e, UK English tends to keep both letters, either as the ligature or separated. But words like fetus or diarrhea are simply mis-spelt in British English. –  Owen Blacker Feb 6 '12 at 18:18

It's just a matter of typographical preference; if you prefer, write "formulae" with separate letters. Same goes for, e.g. the "oe" of "manoeuvre".

Some languages, e.g. French, have a stronger preference for using the ligature. In English, it's not such a common choice nowadays.

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I see. But in Norwegian (and maybe others), Æ denotes its own letter with its own place in the alphabet. –  codebolt Sep 10 '11 at 7:24
    
Yes, that's true: different languages can have different variations on the Roman alphabet that affect which letter combinations or ligatures are considered letters in their own right. In Spanish, for example, some consider "ch" and "ll" to be letters in their own right (though this view is possibly becoming outdated). –  Neil Coffey Sep 10 '11 at 14:44
    
I always knew that LL was a single letter and it is – it's inseparable when writing, such as CH. The wikipedia page says that since 2010 this is disappearing, but on the RAE (Real Academia Española) dictionary, there is nothing about this. –  Alenanno Sep 10 '11 at 17:34
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In English, æ is a ligature representing ae, and I believe it can be used to replace ae in most English words of Greek or Latin origin. However, you'd never replace the ae in metaethics, ultraefficient, or other words where the a and e are in different syllables. Similarly, you wouldn't replace it in words of Scottish origin like brae. –  Peter Shor Sep 10 '11 at 17:41
    
@Alenanno Whatever the RAE's opinion, remember that you are also a human being capable of independent thought. :) –  Neil Coffey Sep 10 '11 at 18:18

Are there any other examples of English words that contain letters not found in the standard English alphabet?

If for “English words”, one counts terms that appear in the Oxford English Dictionary, then yes, there are a very great many such words. Here are just a few examples of the sorts you will find there:

Allerød         fête                       Niçoise         smørrebrød
après-ski       feuilleté                  piñon           soirée
Bokmål          flügelhorn                 plaçage         tapénade
brassière       Gödelian                   prêt-à-porter   vicuña
caña            jalapeño                   Provençal       vis-à-vis
crème           Madrileño                  quinceañera     Zuñi 
crêpe           Möbius                     Ragnarök        α-ketoisovaleric acid 
désoeuvrement   Mohorovičić discontinuity  résumé          (α-)lipoic acid 
Fabergé         moiré                      Schrödinger     (β-)nornicotine
façade          naïve                      Shijō           ψ-ionone

As you see, a great many English words are spelled with letters outside the A to Z set. Just how fussy you are when using these depends in some part on your audience, your input mechanism, and your own care in attending to such details. In modern software, there is no excuse not to use the full character set available to you, but sometimes data may only be entered on a typewriter-style keyboard, lacking all such niceties.

About such things, Robert Bringhurst says the following on pages 179–182 of The Elements of Typographic Style, version 3.2.

(TL;DR: For the summary, skip to the part I’ve editorially set in bold and bold italics, and the paragraph immediately following it.)

9.1 The Hundred‐Thousand Character Alphabet

It is often said that the Latin alphabet consists of 26 letters, the Greek of 24 and the Arabic of 28. If you confine yourself to one case only, a narrow historical window and the dialect in power, this assertion can hold true. If you include both caps and lower case, accented letters and a global set of consonants and vowels — á à â å ã ä ą ă ā æ ǽ ç ć č ð đ é ł ñ ň ņ ő š ș þ ű ū ŵ ý ž ź ż and all the rest — the Latin alphabet is not 26 letters long after all; it is closer to 600 and able to increase at any time. The alphabet that classicists now use for classical Greek, with its long parade of vowels and diacritics — ά ὰ ᾶ ἀ ἃ ἅ ἆ ἁ ἅ ἃ ἇ ᾷ ᾇ, and so on — is modest by comparison: fewer than 300 glyphs altogether.

          To the 600‐character globalized Latin alphabet, mathematicians, grammarians, chemists, and even typographers are prone to make additions: arabic numerals, punctuation, technical symbols, letters borrowed from Hebrew, Greek, and Cyrillic, and, where the letterforms require or invite them, a few typographic ligatures and alternates as well. There is no hope at this stage of counting the number of sorts or glyphs precisely, but the total is clearly over a thousand.

          At the end of the eighteenth century, an English‐speaking hand compositor’s standard lower case had 54 compartments, holding roman or italic a to z, arabic numerals, basic ligatures, spaces, and punctuation. The upper case had another 98, containing caps and analphabetics. That total, 98 + 54 + 152, is the English‐speaking hand compositor’s minimum basic allotment. When more sorts are required, as they very often are, supplementary cases are used. Two pair gave 304 compartments; three pair give 456; four pair gave 608. How Gutenberg’s cases were arranged we do not know, but we know how big they were. He used not 26 but 290 different sorts, in one face and one size, in an unaccented script, to set his 42‐line Bible. The Monotype machine, built five centuries later, with 255 (later 272) positions in a standard matrix case, had fallen only a little ways behind.

          Early computers and e‐mail links were, by comparison, living in typographic poverty. The alphabet they used was the basic character set defined by the American Standard Code for Information Interchange, or ᴀsᴄɪɪ. Each character was limited to seven bits of binary information, so the maximum number of characters was 2⁷ = 128. Thirty‐three of those were normally subtracted for control codes, and one was the code for an empty space. This leaves 94: not even enough to hold the standard working character set of Spanish, French, or German. The fact that such a character set was long considered adequate tells us something about the cultural narrowness of American civilization, or American technocracy, in the midst of twentieth century.

[ . . . ]

          Few of us may need (and few may want to memorize) 100,000 characters. Typographers working Chinese have often mastered 20,000; those who work in Korean learn 3,000 or more; most literate humans learn a thousand characters or fewer. Yet authors, editors, typographers, and ordinary citizens who just want to be able to spell Dvořák, Miłosz, Mą’ii, or al‐Fārābī, or to quote a line of Sophocles or Pushkin, or the Vedas or the Sutras or the Psalms, or to write φ ≠ π, are beneficiaries of a system this inclusive. So is everyone who want to read their e‐mail in an alphabet other than Latin or a language other than English.

          There may also never be a font of 100,000 well‐made characters designed by one designer. But good fonts with well over ten thousand characters, keyed to the Unicode system, are now readily available. Computer operating systems now support them. More importantly, fonts for particular symbol sets and alphabets can be linked and tuned to one another by adjusting weight, letterfit and scale. This kind of typographic diplomacy is a task of some importance — and when character sets are joined in this way, sharing typographic space whether or not they are all on one font, Unicode can serve as a coordinating mechanism.

          Unicode is relatively new, but many of the resources it catalogues are ancient. Composition software, communication links, and keyboards are just starting to catch up.

As Bringhurst says, it’s about inclusiveness — and software is only just now starting to catch up with what the original typesetters, let alone manuscripts, were able to do with perfect ease.

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