1. The doctrine of President Monroe, that America should mind its own business and not entangle itself with the affairs of the Western world, or suffer the interference of other nations.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• nonroe doctrine,
• konroe doctrine,
• jonroe doctrine,
• minroe doctrine,
• mknroe doctrine,
• mlnroe doctrine,
• mpnroe doctrine,
• m0nroe doctrine,
• m9nroe doctrine,
• mobroe doctrine,
• momroe doctrine,
• mojroe doctrine,
• mohroe doctrine,
• moneoe doctrine,
• mondoe doctrine,
• monfoe doctrine,
• montoe doctrine,
• mon5oe doctrine,
• mon4oe doctrine,
• monrie doctrine

The plural form of the word "Monroe Doctrine" is "Monroe Doctrines".

The singular form of the word "Monroe Doctrine" is "Monroe Doctrine". The term itself does not change in its singular or plural form.