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https://en.wikipedia.org/wiki/Monasticism

Monasticism (from Ancient Greek μοναχός, monakhos, from μόνος, monos, 'alone'), or monkhood, is a religious way of life in which one renounces worldly pursuits to devote oneself fully to spiritual work. Monastic life plays an important role in many Christian churches, especially in the Catholic and Orthodox traditions as well as in other faiths such as Buddhism, Hinduism and Jainism. In other religions monasticism is criticized and not practiced, as in Islam and Zoroastrianism, or plays a marginal role, as in modern Judaism. Women pursuing a monastic life are generally called nuns, religious sisters or, rarely, canonesses, while monastic men are called monks, friars or brothers.

Many monastics live in abbeys, convents, monasteries or priories to separate themselves from the secular world, unless they are in mendicant or missionary orders. Titles for monastics differ between the Christian denominations. In Roman Catholicism and Anglicanism, monks and nuns are addressed as Brother (or Father, if ordained to the priesthood) or Mother/Sister, while in Eastern Orthodoxy, they are addressed as Father or Mother.

Buddhism