IPA: /ˈrɛr.nəs/
KK: /ˈrɛr.nəs/
The quality or state of being uncommon or not often found.
The rareness of the species makes it a target for conservation efforts.
Rareness → It is formed from "rare" (from Latin *rarus*, meaning uncommon or infrequent) and the suffix "-ness" (meaning the state or quality of). The word "rareness" refers to the state of being uncommon or infrequent.
Think of something that is 'uncommon' ('rare') and the '-ness' that indicates a state. This helps you remember that 'rareness' means the quality of being uncommon.