[knewter]

We universally agree that it is at least "the wavelength produced from a well-calibrated display when asked to render #ff0000'

[roenxi]

I mean, ok. But that isn't objective. That is a subjective judgement of the display calibration standards body, with no reference to what most people think "red" means.

[knewter]

At least they can reliably compare society's idea of red to their own but I'm pretty sure people's ability to think of red as things outside the rgb gamut is likely diminishing over time.