(of an independent person or body) reach an authoritative judgement or settlement.
Mid 16th century: from Latin arbitrat- ‘judged’, from arbitrari, from arbiter ‘judge, supreme ruler’.
“The whole dilemma will need us to arbitrate!”
The last stage of life; old age.
Senectitude comes from the Medieval Latin noun senectitūdō meaning “old age,” which in turn comes from Classical Latin senectūs, a derivative of the noun senex meaning “old man.” Senectitude entered English in the late 1700s, more precisely, in 1796 in Jonathan Swift’s Gulliver’s Travels