re: #116 Gus 802

An Istory.

The “H” is silent.

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AN HISTORIC / A HISTORIC

You should use “an” before a word beginning with an “H” only if the “H” is not pronounced: “an honest effort”; it’s properly “a historic event” though many sophisticated speakers somehow prefer the sound of “an historic,” so that version is not likely to get you into any real trouble.