Meditative contemplation; more often associated with śamatha practices than vipaśyana. Dhyāna (Sanskrit) or Jhāna (Pali) means meditation in Hinduism, Buddhism and Jainism. In Buddhism, it is a series of cultivated states of mind, which lead to "state of perfect equanimity and awareness (upekkhii-sati-piirisuddhl)."
Dhyana may have been the core practice of pre-sectarian Buddhism, but became appended with other forms of meditation throughout its development.
Example via www.mindpodnetwork.com: Training Psychic Ability