serenity

The goal of meditation is to reach a state of serenity, when your mind is still and perfectly calm. Use serenity to mean the quality or state of being calm and peaceful.

It is hard to believe that the ocean, whipped by winds during a storm, can ever return to a state of serenity, where its surface looks like glass. Serenity is from Latin serenus "calm, peaceful" plus the suffix -itas. The first part of the word is the English adjective serene, which means calm and peaceful. The Latin suffix corresponds to our English suffix -ity and has the meaning "quality or state."

Definitions of serenity
1

n the absence of mental stress or anxiety

Synonyms:
ataraxis, heartsease, peace, peace of mind, peacefulness, repose
Type of:
quietness, quietude, tranquility, tranquillity
a state of peace and quiet

n a disposition free from stress or emotion

Synonyms:
placidity, quiet, repose, tranquility, tranquillity
Types:
ataraxia
peace of mind
Type of:
calm, calmness, composure, equanimity
steadiness of mind under stress