Learn the meaning of loyal as an adjective, with synonyms, example sentences, and pronunciation guides. Find out how to use loyal in British and American English, and explore related words and phrases. LOYAL meaning: 1. firm and not changing in your friendship with or support for a person or an organization, or in…. Learn more. Learn the meaning of loyal as an adjective in English, with synonyms, antonyms, and usage examples. Find out how loyal can describe people, organizations, or principles in different contexts. loy•al (loi′ əl), adj. faithful to one's sovereign, government, or state: a loyal subject. faithful to one's oath, commitments, or obligations: to be loyal to a vow. faithful to any leader, party, or cause, or to any person or thing conceived as deserving fidelity: a loyal friend. characterized by or showing faithfulness to commitments, vows, allegiance, obligations, etc.: loyal conduct.