That aspect of things that is caused by differing qualities of the light reflected or emitted by them, definable in terms of the observer or of the light
That is, colour is a perception, dependent on the observer. Agreed-on colours being those on which typical observers share common experience, is correct.
Wavelengths, pigmentation, and diffraction effects (which give rise to colour in observers) are phenomena.
The terms quale and qualia suggested by @codebolt are indeed quite useful.
(Language itself is shared agreement among symbolic references, given context.)
http://www.dict.org/bin/Dict?Form=Dict2&Database=*&Query=col...
Freedict gives:
That aspect of things that is caused by differing qualities of the light reflected or emitted by them, definable in terms of the observer or of the light
https://www.thefreedictionary.com/color
That is, colour is a perception, dependent on the observer. Agreed-on colours being those on which typical observers share common experience, is correct.
Wavelengths, pigmentation, and diffraction effects (which give rise to colour in observers) are phenomena.
The terms quale and qualia suggested by @codebolt are indeed quite useful.
(Language itself is shared agreement among symbolic references, given context.)