Immobility samādhi

Refers to the fourth stage of samādhi attained by the Buddha on his path to enlightenment.  It is called immobility samādhi as at this stage the language formation process (V: ngôn hành), thought formation process (V: ý hành) and bodily process (V: thân hành) are all immobile.

V: định bất động or ba hành không động