The Collaborative International Dictionary of English v.0.48:

Notebook \Note"book`\, n.
   1. A book in which notes or memorandums are written.
      [1913 Webster]

   2. A book in which notes of hand are registered.
      [1913 Webster]

WordNet (r) 3.0 (2006):

notebook
    n 1: a book with blank pages for recording notes or memoranda
    2: a small compact portable computer [syn: notebook, notebook
       computer]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "notebook":
   Domesday Book, account book, address book, adversaria, album,
   annual, appointment calendar, appointment schedule, best seller,
   blankbook, blotter, book, bound book, calendar, cashbook, catalog,
   classic, classified catalog, coloring book, commonplace book,
   court calendar, daybook, definitive work, desk calendar, diary,
   diptych, docket, engagement book, folio, great work, hardback,
   journal, juvenile, juvenile book, ledger, limp-cover book, log,
   logbook, loose-leaf notebook, magnum opus, memo book,
   memorandum book, memory book, nonbook, novel, opus, opuscule,
   opusculum, pad, paperback, petty cashbook, picture book, playbook,
   pocket book, pocket notebook, pocketbook, police blotter,
   prayer book, production, psalmbook, psalter, publication,
   scrapbook, scratch pad, serial, sketchbook, soft-cover, songbook,
   spiral notebook, standard work, storybook, table, tablet, title,
   tome, trade book, triptych, volume, work, workbook, writing,
   writing tablet, yearbook



The Free On-line Dictionary of Computing (30 December 2018):

notebook

   1.  laptop computer.

   2.  Labtech Notebook.

   (1998-01-05)