'equanimity', also called tatra-majjhattatā (q.v.), is an ethical quality belonging to the sankhāra-group (s. khandha) and should therefore not be confounded with indifferent feeling (adukkha-m-asukhā vedanā) which sometimes also is called upekkhā (s. vedanā).

upekkhā is one of the 4 sublime abodes (brahma-vihāra, q.v.), and of the factors of enlightenment (bojjhanga, q.v.). See Vis.M. IV, 156ff.