The English word meditation comes from the Latin meditatio, which originally indicated every type of physical or intellectual exercise, then later evolved into the more specific meaning "contemplation." This usage is found in Christian spirituality, for example, "meditations on the sufferings of Christ"; as well as Western philosophy, as in Descartes' Meditations on First Philosophy, a set of six mental exercises which systematically analyze the nature of reality. However, "meditation" in its modern sense also refers to a separate practice unrelated to Christian meditations. In the late nineteenth century, Theosophists adopted the word "meditation" to refer to various spiritual practices drawn from Hinduism, Buddhism, and other Eastern religions. Thus the English word "meditation" does not exclusively translate any single term or concept, and can be used to translate words such as the Sanskrit dhyana, samadhi, or pranayama.