"fall" is American, "autumn" is British. "gotten" is American, and there are many other small differences, currently my favorite is "mobile" and "cell phone". Americans say "mobile" like Mo-bull and to hear it spoken like Mo-byle seems odd and yet it's all too familiar but we just call it a cell phone, until we have begun using i-phones, i-pods, i-pads, and the language will never keep pace with technology. Good Q.