Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. Alternative spelling of world line.
Etymologies
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Examples

On the other hand, Dowe's answer is that the worldline of the moving shadow is the worldline of an object that does not possess charge, while the ˜worldline™ of the segments of shadowed plate segments is not the worldline of an object.

Does a physical object of light (photon) GAIN a 'worldline' when it collapses, that it didn't have as wave?

And the question "Where was the 'worldline' before it became 'real' (space? time? spacetime?) and what does it include?" is no more meaningful then "Where was the sound before I clapped my hands?"

Where was the 'worldline' before it became 'real' (space? time? spacetime?) and what does it include?

I view a novel much the way I view any time  or worldline.

We can retain the general relativistic representation of physical spacetime as a 4dimensional manifold, equipped with a metric tensor of Lorentzian signature, but for each worldline & #947 representing a physical system with a mind supervening upon it, we can introduce a subjective time tensor.

The conformal factor & #937 blows up towards the end of the worldline of a mental system, providing such a system with an infinite lapse of subjective time, even though, to an external observer, a finite time lapses before the death of that system.

Let & #964 denote the proper time along the worldline; this is determined by the metric of the physical spacetime, and a finite proper time will elapse along the worldline of any mortal.

Yes, the Captain was moving along a geodesic and you might say that geodesics are longest paths, but that would only be correct in the infinitesimal sense: any infinitesimally small deviation from Captain's geodesic worldline will reduce its length, so it's a local maximum.

Like in wave optics, it turns out that most of the paths cancel out and only those which are closest to the classical trajectory contribute significantly, hence a slightly blurred classical worldline.
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