Definition of happiness
1. feeling pleasure: feeling or showing pleasure, contentment, joy or happy smiling faces
happy smiling faces
2. causing pleasure: causing or characterized by pleasure, contentment, or joy a happy childhood
3. satisfied: feeling satisfied that something is right or has been done right
Are you happy with your performance?
4. willing: willing to do something
I'd be only too happy to help.
5. fortunate: resulting unexpectedly in something pleasant or welcome a happy coincidence
6. tipsy: slightly drunk ( informal )
7. too ready to use something: inclined to use a particular thing too readily or be too enthusiastic about a particular thing ( used in combination )