Noun
Verb (する, intransitive)
1. relief; reassurance
彼はその声を聞いて安堵する。He feels relieved upon hearing that voice.
Noun
Verb (する, transitive)
Historical
2. recognition of right to land ownership (by the shogunate, a feudal lord, etc.)
Archaic
Noun
Verb (する, intransitive)
3. living safely surrounded by walls
orig. meaning