Dear diary, you are a written record of things that happen each day. Some people keep a diary while they’re traveling, others keep their secrets in a diary. Either way, keep out!

Some diaries have a pretty cover and a tiny lock with a key, for keeping the contents safe from prying eyes. You can also call such a book a "journal," although traditionally a diary is written in each day, while a journal might have less frequent entries. The word diary comes from the Latin word diarium, "daily allowance," with its root of dies, or "day."

Definitions of diary
  1. noun
    a daily written record of (usually personal) experiences and observations
    synonyms: journal
    see moresee less
    blog, web log
    an online journal where people can post entries about their experiences
    type of:
    piece of writing, writing, written material
    the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)
  2. noun
    a personal journal (as a physical object)
    see moresee less
    type of:
    a record book as a physical object
Word Family

Test prep from the experts

Boost your test score with programs developed by’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week