Definition of notebooks:
(n) :
A book in which notes or memoranda are written.
(n) :
(computing, sometimes attributive) A kind of user interface in literate programming, allowing calculations to be interspersed with human-readable comments, diagrams, etc.
(n) :
(computing) Ellipsis of notebook computer (“laptop computer”). [(computing) A class of laptop computer that is around the size of a paper notebook with A4 or letter-sized pages.]