'Deliverance of mind', in the highest sense, is that kind of concentration samādhi which is bound up with the path of Arahatship arahatta-magga deliverance through understanding' is the knowledge ñāna bound up with the fruition of Arahatship arahatta-phala Cf. A. V, 142.
There are also 5 kinds of deliverance, identical with the 5 kinds of overcoming; pahana.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.