0 01i 00Webster's Dictionary of English Usage02i 00 has: 02br 01blockquote 00Before 11i 10h12i 10 in an unstressed or weakly stressed syllable, 11i 10a12i 10 and 11i 10an12i 10 are both used in writing (11i 10an12i 10 historic, 11i 10a12i 10 historic) but 11i 10an12i 10 is more usual in speech, whether the 11i 10h12i 10 is pronounced or not. This variation is the result of historical development; in unstressed and weakly stressed syllable, 11i 10h12i 10 was formerly not pronounced in many word where it is pronounced at the present time. A few words, such as 11i 10historic12i 10 and (especially in England) 11i 10hotel12i 10, are in transition, and may be found with either 11i 10a12i 10 or 11i 10an12i 10.
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00Before 11i10h12i10 in an unstressed or weakly stressed syllable, 11i10a12i10 and 11i10an12i10 are both used in writing (11i10an12i10 historic, 11i10a12i10 his