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In modern written English, the forma is used before a word beginning with a consonant sound, however it may be spelled (a frog, a university, a euphemism ). The forman is used before a word beginning with a vowel sound ( an orange, an hour ). At one time,an was an acceptable alternative before words beginning with a consonant sound but spelled with a vowel ( an one, an united appeal ), but this usage is now entirely obsolete. ·An was also once a common variant before words beginning with h in which the first syllable was unstressed; thus 18th-century authors wrote eithera historical or an historical but a history, not an history. This usage had a phonetic justification inasmuch as the initialh in words such as historical and heroic was often dropped, a practice that was largely abandoned by the late 19th century in educated speech.By 1926 H.W. Fowler could regard the continued use ofan before such words as pedantic. Nowadays it survives primarily before the wordhistorical; one rarely encounters a reference toan hysterectomy or an hereditary trait. The use of a phrase likean historic opportunity is a harmless adornment in formal writing.
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