a. 1. Registered. [ 1913 Webster ]
2. On the way; destined. [ Colloq. ] [ 1913 Webster ]
3. reserved in advance; held for future use. See reserve{ 2 }. [ PJC ]
a. Not written in a book; unrecorded. “UnbookedEnglish life.” Masson. [ 1913 Webster ]