Thesaurus Day - January 18
Thu, Jan 18, 2024

Thesaurus Day

Thesaurus Day is an American holiday dedicated to the thesaurus. This wonderful collection of various terms will allow you to better know your native language, as well as become more erudite, expand your horizons. It is celebrated annually on January 18.


The history of thesauri dates back centuries. The most suitable for the requirements put forward for modern thesauri is “Amara-kosha” in Sanskrit. This work was created in the 6th century. The style of presentation is poetic.

Historians call the first modern thesaurus the thesaurus created by the Englishman P.M. Roger in 1805. The first publication was made only in 1852, but since then it has been produced in its original form without reprints.

In the second half of the 20th century, when computerization began to proceed at a rapid pace, thesauri began to be used to perform tasks of searching and analyzing information. Today they are used for artificial intelligence. Thesauri differ from classical dictionaries in that they give not only a complete definition of a term, but also give several similar definitions that, one way or another, reflect its essence.

Interesting facts

  • Word has its own thesaurus for word processing.
  • In psychology, the term “thesaurus” characterizes the characteristics of the perception of information by an individual.
  • Thesaurus is not a synonym for the word dictionary. It focuses on narrower terms, while the dictionary is a list of any words.

How to celebrate

Spend a few hours studying a modern thesaurus at Thesaurus Day to enrich your knowledge with new words. You can also search for versions of old thesauri to find out what they were like in antiquity.

Tell about the holiday on social networks. Discuss with other users what new words you have learned. Perhaps you were surprised by the significance of any of them.

When is Thesaurus Day celebrated in 2024?

Thesaurus Day is observed on January 18 each year.


Weekday Month Day Year
Thursday January 18 2024
Saturday January 18 2025
Sunday January 18 2026
Monday January 18 2027