Wellness is the opposite of illness. When you're healthy and not suffering from any diseases, you're enjoying a state of wellness.

It might seem like the phrase "health and wellness" is a little repetitive, but the two terms have increasingly distinct meanings. Since the middle of the 20th century, wellness has become the popular term, especially in alternative medicine, to describe health that includes a balance of body, mind, and spirit.

Definitions of wellness

n a healthy state of wellbeing free from disease

illness, malady, sickness, unwellness
impairment of normal physiological function affecting part or all of an organism
Type of:
eudaemonia, eudaimonia, upbeat, welfare, well-being, wellbeing
a contented state of being happy and healthy and prosperous