Fall. 
Autumn. sounds prettier.
@Kate
@Kate I call it Autumn. Fall is just a desripsion of a leaf falling, I perfer proper english, so I use the classic 'Autumn' instead of the Americanized 'Fall'. 
@PessimisticTree - see below about when and how "Fall" started as a description for this season. (1600s - America didn't exist yet!)
fall
Fall is the season; autumn is a part of it
Fall
Fall
Either depending on who I
@Kate The word autumn was, then, a big hit. Names for theseason didn't just end with autumn, however. Poets continued to be wowed by the changes autumnbrought, and in time, the phrase "the fall of the leaves" came to be associated with the season. This was shortened in the 1600s to fall.
@DUREKHAN - Hi. Where is this from, please? Cite source? ~ Platy