Contained in an official list (of members, employees, clients, projects etc.). / (business, accounting) Officially recorded in the financial records of a company or organization.

The qualities that make a book what it is.

A notebook or memorandum book. / A subordinate book containing notes or jottings to be afterward extended in due form.

(intransitive, idiomatic) To check in (to a hotel). / (transitive) To reserve an appointment for.

plural of bookful

A surname.

(theater) Acting as prompter.

plural of Book

present participle of book it

(idiomatic) Of a single resource, reserved for two different users at the same time.