established in a desired position or place; not moving about; "nomads...absorbed among the settled people"; "settled areas"; "I don't feel entirely settled here"; "the advent of settled civilization"
established or decided beyond dispute or doubt; "with details of the wedding settled she could now sleep at night"
(law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature); "the rationale for capital punishment"; "the principles of internal-combustion engines"