Adhinayak means “ruler”.
Jana Gana Mana is the National Anthem of India. The national anthem is actually the first stanza of a poem written by Rabindranath Tagore. It was a hymn written highly Sanskritised Bengali.
The first line of the anthem goes as, “Jana ga?a mana-adhina?aka ja?a he bharatabhagyabidhata!” This translates to “Thou art the ruler of the minds of all people,
Dispenser of India’s destiny.” Hence, adhina?aka means “Ruler”.
In the poem, and the anthem, the term “adhina?aka” refers to the God of Destiny who rules the minds of all people and holds the ‘the reins of India’s chariot through rise and fall, through the straight path and the curved’.