What exactly is ‘pumpkin spice?’

Every year when fall rolls around, pumpkin-flavored items begin to pop up everywhere you look. Most notably is the return of Starbucks' Pumpkin Spice Latte, but what makes something 'pumpkin spice?'
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Every year when fall rolls around, pumpkin-flavored items begin to pop up everywhere you look. Most notably is the return of Starbucks' Pumpkin Spice Latte, but what makes something 'pumpkin spice?'