Autumn and Fall

The words "autumn" and "fall" meaning the season that begins today in the Northern Hemisphere both originated in Britain, but one is more commonly used there while the other is more common in America. By the mid-1800s, "fall" was considered to be the  American season by lexicographers.

Autumn is the older word. It came into English in the 1300s from the Latin word autumnus.

At one time there was an intermediary season preceding our autumn that was called "harvest." It seems that autumn came into usage to distinguish between the time when one harvests crops and the actual crop harvest itself.

Writers, especially poets, wrote about the seasonal colors of this time and the phrase "the fall of the leaves" came into more common usage. That phrase was shortened sometime in the 1600s to "fall." This coincides with English moving across the ocean with explorers and settlers to the New World. But both words must have been used in the New World as they were in Britain because "fall" for the season doesn't appear until 1755 when Samuel Johnson added it to his Dictionary of the English Language.

Fall is still occasionally used in countries where British English is spoken, but more likely in phrases, like "spring and fall." American though I may be, I prefer autumn, since it is used to mark the Autumnal Equinox.