Definition - What does Upeksha mean?
Upeksha is a Sanskrit term that describes non-attachment, a balanced mind and tolerance. In Buddhism, it is one of the four elements of true love, together with loving-kindness (maitri), compassion (karuna) and joy (mudita). In yoga, these four elements are seen as different features of universal kindness and are considered the four qualities of a jivanmukta, or one who has achieved liberation (moksha). Abiding in upeksha means inhabiting the mental state of non-self and non-possesive love.
Yogapedia explains Upeksha
Upeksha is the fourth of the Buddhist Brahmaviravas ("four immeasurables"), which are also mentioned in Patanjali's Yoga Sutras. It is a state of mind taught both in Buddhism and in yoga. Although it is sometimes translated as indifference, the correct translation is equanimity. Upeksha means leading a balanced life, removing intolerance and caring for all equally.
Upeksha teaches the practice of non-attachment, an important element in yoga practice both on and off the mat.