English

Suffix

1. Appended to adjectives to form nouns meaning "the state of (the adjective)", "the quality of (the adjective)", or "the measure of (the adjective)".

   calmness ← calm

   darkness ← dark

   kindness ← kind

   oneness ← one

2. Appended to words of other parts of speech to form nouns (often nonce words or terms in philosophy) meaning the state/quality/measure of the idea represented by these words.

   thatness ← that

   treeness ← tree