Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: a navigable body of water (such as a sea) that is open to all nations
: freedom of the seas
1652, in the meaning defined at sense 1
New Latin, literally, free sea
Keep scrolling for more
Share mare liberum
Resources for mare liberum
Time Traveler for mare liberum
See more words from the same year
Comments on mare liberum
What made you want to look up mare liberum? Please tell us where you read or heard it (including the quote, if possible).
to make faulty or ineffective
Get Word of the Day daily email!
Late Autumn 2018 Words of the Day Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Words from the week of 12/14/2018
Yeggs, jackrollers, footpads, and more
Stuck in the middle with usage
Focusing in on what we do best
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
More word puzzles to rack your brain
SCRABBLE® fans, sharpen your skills!