cau·​tio | \ ˈkȯshēˌō, ˈkau̇tēˌō \
plural cautiones\ -​shēˈōˌnēz , -​tēˈōˌnās \

Definition of cautio

Roman, Scots, & civil law
: an oral or written agreement to indemnify : guaranty:
a : a written assurance given as evidence of the receipt of money or as an acknowledgment of the making of a promise or of an existing state of affairs
b : an agreement by one furnishing security, a pledge, or a mortgage
c : an agreement often imposed by a judge or magistrate whereby one guarantees to protect another from loss or harm caused by the guarantor or a third person for whom the guarantor is responsible or whereby one guarantees payment or performance of an obligation of another

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for cautio


Keep scrolling for more

Learn More about cautio

Statistics for cautio

Cite this Entry

“Cautio.” Dictionary, Merriam-Webster, Accessed 15 Jan. 2021.

Comments on cautio

What made you want to look up cautio? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Words of Snow and Ice Quiz

  • image1037863653
  • Which of the following refers to thin, bending ice, or to the act of running over such ice?
True or False

Test your knowledge - and maybe learn something along the way.


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!