Obligation
The solemn promise made by a Freemason on his admission into any Degree is technically called his obligation. In a legal sense, obligation is synonymous with duty. Its derivation shows its true meaning, for the Latin word obligatio literally signifies a tying or binding. The obligation is that which binds a man to do some act, the doing of which thus becomes his duty. By his obligation, a Freemason is bound or tied to his Order.
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This page is adapted from the Glossary at Phoenixmasonry — Used with permission.