> In antiquity it was more what we might call street foodIn context, though, the original commenter considered things like street hotdog vendors to be fast food. That is not unlike the kind of delivery you would find in antiquity, even if the actual food product differed.
> What really defines fast food is mass production and uniformity.
Technically, what really defines a term is how it is used in a certain context and how it works towards reaching a shared understanding, which was achieved with the original use of fast food found in this thread. You are right that the definition that emerged here does not align with definitions found in other contexts, but those other contexts are irrelevant to this particular context.