Pastness is a 8 letter English word. It's valid Scrabble word worth 10 points. It's valid Words with friends word worth 12 points.
You can make 231 anagrams from letters in pastness (aenpssst).
First recorded in 1820-30; past + -ness
There may be a specific feeling which could be called the feeling of "pastness," especially where immediate memory is concerned.
They give to the memory image a feeling of pastness and trueness which the image of imagination lacks.
In the latter case, but not in the former, the pastness is part of the content believed.