To save this word, you'll need to log in.
ma·re li·be·rum | \ ˈmär-(ˌ)ā-ˈlē-bə-ˌru̇m 
\
\Definition of mare liberum
1 : a navigable body of water (such as a sea) that is open to all nations
Keep scrolling for more
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).
Test Your Vocabulary
More Confusing Words—Quiz
- The magician
______moved the selected card to the top of the deck.
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
- More Confusing Words—Quiz
How many of these commonly confused words do you know?
Take the quiz - Name that Thing: Toys and Games Edition
It's all fun and games until someone beats your high score.
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Syn City
Build a city of skyscrapers—one synonym at a time.
Play the game
Share mare liberum
Time Traveler for mare liberum
The first known use of mare liberum was in 1652
See more words from the same year