निश्चिन्ताधिगताभीष्टा हेयोपादेयवर्जिता ।प्रोक्ता समाधिशब्देन परिपूर्णा मनोगतिः
In plain words
A movement of the mind free of every care, having attained what it longed for, beyond both what is to be rejected and what is to be accepted, perfectly full -- that is what is declared by the word 'samādhi'.