I'm very new at this so the following may be an unusual usage, but I have seen 'fade' (the verb) used in one additional context beyond those mentioned above.
When spread point odds are adjusted off of symetrical odds.
[e.g. a NFL game goes from -3pts -110/+3pts -110 to -3pts -115/+3pts -105 (instead of -4pts -110/+4pts -110).] I have seen this referred to as 'fading the odds'.
-punter pup