A, an
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Template:Wiktionarypar Template:Wiktionarypar A and an function as the indefinite forms of the grammatical article in the English language and can also represent the number one.
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An
An is the older form, now used before words starting with a vowel sound, regardless of whether the word begins with a vowel letter. Examples: a light-water reactor; an LWR; a HEPA filter (because HEPA is pronounced as a word rather than as letters); a hypothesis; an hour.[1] However, it is still often considered proper to use an before any noun starting with h.
More examples: "a boy, a European, a j, a picture, a store, a table, a bottle, a window, a phone, a hyphen, a one-horse town" and "a united country, a usurper, a eulogy, a ewe, a U-boat" and "an entry, an f, an hour, an orange, an ape, an odor, an idea, an eagle, an honor, an umbrella, an unbeliever" and "a hotel, a house, a hill, a hymn, a honeycomb". [2]
"Merriam-Webster's Dictionary of English Usage is more descriptive than prescriptive, but it advises: You choose the article that suits your own pronunciation. Theodore Bernstein gives the straight vowel-sound-vs.-consonant-sound explanation but allows that you should indeed say "an hotel" if you think hotel is pronounced otel." [3]
Junctural metanalysis
In a process called junctural metanalysis, the N has wandered back and forth between words beginning with vowels over the history of the language, where sometimes it would be a nuncle and is now an uncle. The Oxford English Dictionary gives such examples as smot hym on the hede with a nege tool from 1448 for smote him on the head with an edge tool and a nox for an ox and a napple for an apple. Sometimes the change has been permanent. For example, a newt was once an ewt (earlier euft and eft), a nickname was once an eke-name, where eke means "extra" (as in eke out meaning "add to"), and in the other direction, "a napron" became "an apron." "Napron" itself meant "little tablecloth" and is related to the word "napkin". Another example is that "an orange" used to be written "a norange" (cf. Spanish naranja), until the 'n' shifted from the beginning of the noun to the end of the article.
Using "An" Instead of "A" Before a Pronounced "H"
The form "an" is always prescribed before words beginning with a silent "h," such as "honorable," "heir," "hour," and, in American English, "herb." Some British dialects (e.g., Cockney) silence all initial "h's" and so employ "an" all the time: e.g., "an 'elmet". Many British usage books, therefore, discount a usage which some Americans (amongst others) employ as being a derivative of the Cockney. The reason is that the indefinite article "a" is pronounced either of two ways: as a schwa or as the letter itself is pronounced, "long a." Some words beginning with the letter "h" have the primary stress on the second or later syllable. Pronouncing "a" as a schwa can diminish the sound of the schwa and melt into the vowel. Pronouncing it as a "long a" does not do this, but the pronunciation cannot be prescribed, the word is spelled the same for either. Hence "an" may be seen in such phrases as "an historic," "an heroic," and yes, "an hôtel of excellence" was the by-line in an advertisement in a New York City newspaper.
Such was also the case for some other words which take the place of the article. "My" and "thy" became "mine" and "thine," as in "mine uncle."
The appearance of "an" or "a" in front of words beginning with "h" is not only limited to stress. Sometimes there are historical roots as well. Words that may have had a route into English via French (where all "h"s are unpronounced) may have "an" to avoid an unusual pronunciation. Words that derived from German however would use "a" as the "h"s would be pronounced. There is even some suggestion that fashion may have had some influence. When England was ruled by a French aristocracy, the tradition may have been to exclusively use "an", whilst when Britain was governed by a German based monarchy the tide may have changed to "a".
Represents the number one
In addition to serving as an article, a and an are also used as synonyms for the number one, as in "make a wish", "a hundred". An was originally an unstressed form of the number án 'one'.
A and an are also used to express a proportional relationship, such as "a dollar a day" or "$50 an ounce", although historically this use of "a" and "an" does not come from the same word as the articles.
The mathematically-minded might heed H. S. Wall's reminder that the statement "I have a son" does not necessarily imply that "I have exactly one son" or that "I have only sons". In other words, "The little words count." — H. S. Wall, Creative Mathematics.