IPA: /ˈoʊp.nəs/
KK: /ˈoʊpənnəs/
The quality of being open, allowing access, sharing, or communication without restrictions.
Her openness to new ideas made her a great team leader.
Openness is formed from "open" (from Old English "open", meaning not closed or obstructed) and "-ness" (a suffix used to form nouns indicating a state or condition). The word "openness" refers to the state or condition of being open, whether physically or metaphorically.
Think of the word 'open' to remember that 'openness' means the state of being open.