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
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        My car mechanic stops by,  looks under the hood and uses a strobe light gun-thingy to set my amp's timing.  Changes the oil, too.

Tim  
I'm not so sure that "timing" is the best adjective. Perhaps it refers to the ability of an amp to handle transient spikes in conjunction with damping factor to present an accurate representation of the original performance. But I'm just speculating here. Play on....
" PRAT are the most basic building blocks of a musical performance ". TNT audio...…..I personally came to the realization of it in the late 60s, but in my circle, it was Pace, Rhythm, Attack and Timing. I was a Linnie, and all gear was either good at it, or not. Make fun if you will....as always, to each his own.....Enjoy ! MrD.
If you don't believe in PRAT, all you have to hear is a SLI-80 in comparison with VSI75. SLI-80 is slow in both directions, rise and decay and the decay is especially wrong, as in it hangs too long, too loud and then just stops. And that basically breaks everything, but especially sound staging. VSI75 is wide and deep, SLI80 is flat. I still have one SLI80 and it's a great background music piece, precisely because the PRAT is all wrong.