ad placitum
/ˌad ˈplasɪtəm/Chiefly Philosophy
adverb
By arbitrary application of a word or sign to a particular meaning, without a natural or logical basis. More generally: arbitrarily, as one pleases.
Origin
Mid 16th century; earliest use found in Thomas Cranmer (1489–1556), archbishop of Canterbury. From post-classical Latin ad placitum by agreement from classical Latin ad according to + placitum opinion, condition, in post-classical Latin also agreement.