monastic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or characteristic of a monastery. Used often of monks and nuns.
• adjective Resembling life in a monastery in style, structure, or manner, especially.
• adjective Secluded and contemplative.
• adjective Strictly disciplined or regimented.
• adjective Self-abnegating; austere.
• noun A monk.

from The Century Dictionary.

• Pertaining to or characteristic of monks or nuns; ascetic: as, monastic life, vows, or practices.
• Adapted to or suitable for monks or nuns; of ascetic character or use: as, monastic buildings or architecture; monastic seclusion.
• An epithet noting a style of book-decoration in which medieval forms of compact ornament are strongly stamped on the sides or back of the book without any use of gold-leaf.
• an abbot who was also a bishop; or
• a monk consecrated bishop, resident in a monastery, and exercising his office in confirmations, ordinations, etc., but without jurisdiction.
• noun A monk; a religious recluse.

from the GNU version of the Collaborative International Dictionary of English.

• noun A monk.
• adjective Of or pertaining to monasteries, or to their occupants, rules, etc., .
• adjective Secluded from temporal concerns and devoted to religion; recluse.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of or relating to monasteries or monks.
• noun A person with monastic ways, e.g. monks.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a male religious living in a cloister and devoting himself to contemplation and prayer and work
• adjective of communal life sequestered from the world under religious vows