Amp "timing" ?


I was reading someone raving about the impeccable "timing" of their high-end amp this morning.  I have heard this term tossed around several times recently in my dive back into highish-end audio. 

Can someone please explain what is meant by this term?  Is it snake-oil or confirmation bias?  I just don't understand how a human  can hear  a timing difference of a soundwave unless it's a 2nd+ order reflection.  

Thoughts?
dtximages
Whether it was to this concept of, "timing" that, "someone" was referring(or not), here’s an explanation of, "PRAT"(whether anyone accepts it or not): https://www.stereophile.com/reference/23/index.html (Timing is mentioned on the second page) " But it should be quite obvious that an amplifier can’t change the timing of music....", would be my stance as well, in the context of that article(ie: How tight a group might sound, in playback).
dtximages
Why do I feel like we’re being duped here ... I’m just getting tired of all the "and the veil was lifted" colour that people are adding to their reviews/opinions that have zero basis. But I’m still open to this timing thing if it has a basis because I LOVE believing things sound different and better, I’m just not always convinced it’s true.
I suggest that you listen for yourself, and then decide. There's just no substitute for personal experience.
The only maeasurable parameter that might, and I emphasize might, be involved here is the amplifier slew rate, that is, how many volts/microsecond can it increase?
It's just another way to describe a component,cable,etc. that gives the impression of a livelier presentation.I have heard it myself when trying various tubes.
Ok cool now we're getting somewhere.  So the amount of time something kinda lingers like maybe a quick cymbol.  I would like to hear a "poor timed amp" next to a "good timed amp" to see exactly what I should be listening for. 

Any preferred Spotify tracks to carefully listen to where I might hear this?