Three letter rule

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In English spelling, the three letter rule (or short word rule) is the observation that "content words" tend to have at least three letters. In particular, content words containing fewer than three phonemes may be augmented with letters which are phonetically redundant, such as ebb, add, egg, inn, bee, see, awe, buy, owe, etc.

The phenomenon does not apply to function words, such as I, be, do, if, of, etc.

[edit] Origin

Many content words would be homographs of common function words if not for the latter's "redundant" letters: e.g. be/bee, in/inn, I/eye, to/two.

Otto Jespersen, describing the phenomenon in 1909, suggested the short spelling was a marker of reduced stress. Content words always have at least one stressed syllable, whereas function words are often completely unstressed; shorter spellings help to reflect this. (Interjections such as ah, eh, lo, yo are always stressed. Punctuation serves to isolate these elements.)

In Old English, inflections increased the length of most content words in any case. Through to the seventeenth century, before English spelling was firmly settled, short forms for some content words did occur, such as eg (egg), ey (eye), lo (low), etc. Conversely, poets such as John Milton alternated between short and long forms for function words, depending on whether they occurred on or off the meter. For instance:

So spake the false Arch-Angel, and infus'd
Bad influence into th' unwarie brest
Of his Associate; hee together calls,
Or several one by one, the Regent Powers,
Under him Regent, tells, as he was taught,
(Paradise Lost, Book 5, ll. 694-698)

[edit] Exceptions

While many function words have more than two letters (and, she, were, therefore, etc etc), the exceptions to the rule are rather two-letter content words.

Only a few of these occur commonly in most texts: the words go (which has a functional usage in the idiom going to do something), ox, and ax (usually axe in Commonwealth English).

English grammar is relatively flexible about altering the class of words, allowing verbal uses such as to up the ante, or nominal uses such as the ins and outs.

Many recent loanwords retain spelling from the source language, or are romanized according to non-English phonetic conventions. This has resulted in short words such as the notes of the solfege scale (do, re, mi, etc.; from Latin via Italian), or the Greek alphabet (pi, nu, etc.), and miscellaneous others such as bo, qi, ka. Carney calls such words "exceptions which prove the rule, clearly marked as exotic by the spelling".

In less formal contexts, increasing numbers of abbreviations are found; short examples include ad(vertisement), bi(sexual). Similarly there are many nicknames; for example, Al, Ed, Jo, etc.

[edit] References

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