'bailable' originates from English, formed from the verb 'bail' + the adjectival suffix '-able' (from Old French '-able'), where 'bail' originally meant 'to hand over or deliver' in Old French 'baillier'.

'bail' changed from Old French 'baillier' (and related medieval forms) and was adopted into Middle English as 'bail', later combining with the suffix '-able' to form the modern adjective 'bailable'.

Initially, 'bail' chiefly meant 'to deliver or hand over'; over time it acquired the legal sense of 'to secure temporary release by providing security', and 'bailable' now means 'capable of being released on bail'.