English
thatness
From that + -ness.
Formed from that + -ness
Proto-Indo-European *tód
…
Proto-Germanic *þat
Proto-West Germanic *þat
Old English þæt ‘the’
Middle English that
English that
Today it means
noun The quality or characteristic of being that (something referred to).
Language periods are conventional ranges, not dates for this word.
Etymograph / thatness