IPA: /ˈpæst.nəs/
KK: /ˈpæstnəs/
The state or quality of being in the past; a feeling or emotion related to memories.
The pastness of the old photographs brought back many memories for her.
Pastness → The word is formed from "past" (from Old English *pæst*, meaning gone by or elapsed) and the suffix "-ness" (meaning the state or quality of). Thus, "pastness" refers to the state of being past or the quality of having elapsed time.
Think of the word 'past' meaning something that has gone by, and '-ness' indicating a state. So, 'pastness' helps you remember the quality of time that has already elapsed.