Single-pointed placement of the mind on any constructive focal object, without any mental wandering – a stable state of mind that is not only free of flightiness and dullness, but is also not distracted by any disturbing emotion of the plane of sensory desires. In Mahayana, when conjoined with bodhichitta, a far-reaching attitude. Often translated as concentration, and sometimes as mental constancy.
Tibetan: བསམ་གཏན། bsam-gtan
J. Hopkins: Concentration