Is it acceptable to use the word 'autumn' in American English?

It's perfectly fine. It has a slightly literary tinge, we (Americans) usually say "fall" in casual speech, but "autumn" is understood by pretty much everyone. Personally I will avoid it when there's an awkward cadence to it. read more

It's perfectly fine. It has a slightly literary tinge, we (Americans) usually say "fall" in casual speech, but "autumn" is understood by pretty much everyone. read more

Fall and autumn are both accepted and widely used terms for the season that comes between summer and winter. Some who consider British English the only true English regard fall as an American barbarism, but this attitude is not well founded. read more

In fact, the "autumn" sense of fall wasn't even entered into a dictionary until 1755, when Samuel Johnson first entered it in his Dictionary of the English Language. By the middle of the 1800s, American English and British English had diverged, and so had fall and autumn. read more