So is it ‘fall’ or is it ‘autumn?’ And why is it the only season with two names?

From Slate:

It’s the first week of fall—or perhaps I should say “autumn.” How did autumn become the only season with two names?

Before it was autumn and fall, it was harvest. While the modern names of winter and summer have been around for more than 1000 years, the names of fall and spring are more recent—and less constant. This is partly because the two seasons were long viewed as secondary to summer and winter. As late as the 18th century, English speakers were less likely to think of the year as having four seasons, focusing instead on the coldest and warmest portions of the year. Even when they spoke of fall, they couldn’t agree when, exactly, it took place. In the 17th and 18th centuries, dictionaries by both Thomas Blount and Samuel Johnson noted that some thought that fall began in August and ended in November, while others contested that it began in September (at the equinox) and ended in December (with the solstice).

Both spring and autumn used to go by different names. In the 12th and 13th centuries, spring was called lent or lenten, while fall was called harvest. In the 14th century things got a little chaotic. Lenten disappeared around the beginning of the 1300s, and the later lent similarly vanished only a few decades later. (It survives, of course, as the name for a religious observance.) By the end of the 14th century there was no firm word for springtime: People referred to it as part of summer, they used Latin (ver) or French (primetemps), or they just made up new phrases. Harvest as a word to mean not just “a time of reaping” but also, even for city folk, “the third season of the year” lasted longer. But it was joined by autumn—a word borrowed the French—by the 16th century.

Spring and fall likely gained popularity in conjunction with each other. They each initially appeared in the 16th century as spring of the leaf and fall of the leaf, respectively. The two complemented each other nicely and were soon shortened to the more succinct fall and spring, with the longer phrases disappearing over the next few hundred years.

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