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Fun Holiday – Dictionary Day

Dictionary Day is on October 16. The unofficial holiday celebrates the birth anniversary of American lexicographer, Noah Webster.

16Oct
Dictionary Day
Friday, October 16, 2026
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A macro photograph of a printed page from an encyclopedia, focused on the word "knowledge."
Learn a few new words to celebrate Dictionary Day.
© iStockphoto.com/firebrandphotography

Born on October 16, 1758, Webster is best known for publishing An American Dictionary of the English Language, the precursor of the now famous and widely used Merriam-Webster Dictionary.

Reference Book

A dictionary is a reference book that lists words in a language and provides the meaning, origin and pronunciation of each listed word. The book also informs users on how to use a word in different circumstances.

Semasiological, of Course

Dictionaries are semasiological. Semasiology is the branch of linguistics that deals with the definition of words and phrases in a language. This is different from onomasiology, which deals with what things and concepts are called. A thesuarus is an onomasiological reference book because it provides users the different terms that can be used to express a specific idea.

How to Celebrate?

  • Pick up a dictionary and try to learn the meanings of at least 5 new words.
  • Learn more about the history and science behind publishing dictionaries.

Did You Know...

...that pneumonoultramicroscopicsilicovolcanoconiosis is the longest word in the Merriam-Webster dictionary? At 45 letters, the word refers to a lung disease.