An allusion is something that refers to an event or anecdote or parable, that has a point that the speaker is trying to make.
It's not really literal. Your thinking is being taken somewhere else to get some other point.
It's not context. You are gaining nothing by trying to figure out the correct context. Allusions suggest other meanings. The context isn't what is important. Allusions don't work that way.
It's anything but technical. If it was technical it would only appeal to those people who worked with the same vocabulary.
It is figurative. It is something that suggests something else and that is almost always figurative.