Origin: Germanic Old English suffix
Happiness has 3 different meanings across 1 category:
emotions experienced when in a state of well-being
"The warm sunlight filled her heart with a deep happiness that came from being healthy and surrounded by loved ones."
The emotion of being happy; joy.
"Her happiness was evident in her bright smile and light step as she walked into the room."
In plain English: Happiness is that good feeling you get when things go your way and everything seems perfect right now.
"She smiled with pure happiness when she saw her friend at the door."
The word happiness is formed by adding the suffix "-ness" to the adjective happy. This construction follows a common pattern where abstract nouns are created from descriptive words.