What is defined as any person detained or subject to detention in custody whose release may lawfully be effected by bail?

The term that accurately refers to any person detained or subject to detention in custody whose release may lawfully be effected by bail is 'Arrestee.' An arrestee is an individual who has been taken into custody typically due to an arrest for suspected criminal activity. This term encompasses anyone who is in a position where their release can be achieved through the posting of bail, which is a financial arrangement allowing a temporarily detained individual to secure their freedom while awaiting trial.

In legal terminology, while a defendant is generally someone who has been formally charged with a crime, an arrestee includes those who may still be in the preliminary stages of the legal process, where bail options are being discussed. The terms 'bailee' and 'criminal' do not apply here in the context of being the person whose release is being considered. A bailee refers to a person or entity that receives personal property from another (the bailor) under a contract of bailment, and 'criminal' is a broad category that does not specifically denote someone currently held in custody with the option of bail. Thus, the definition provided aligns precisely with the term 'Arrestee.'