If you are faithful and devoted to someone or something, you're loyal. If you refuse to buy milk from anyone other than Farmer Jones, then you're a very loyal customer.
Someone who is loyal is reliable and always true, like your trusty dog. Loyal comes from the Old French word loial which means something like "legal," but if someone is only loyal to you because the law requires him to be, that's not true loyalty, which should come from the heart, not a contract. A loyal friend supports you all the time, no matter what. You can also be loyal to an idea, like the People's Revolution, or girl-power.
adj steadfast in allegiance or duty
steadfast in devotion (especially to your lawful monarch or government)
resembling a dog; especially in devotion
faithful and true
owing or owed feudal allegiance and service
marked by unswerving loyalty
inspired by love for your country
deserting your allegiance or duty to leader or cause or principle
faithless, traitorous, treasonable, treasonous, unfaithful
having the character of, or characteristic of, a traitor
insurgent, seditious, subversive
in opposition to a civil authority or government
consisting of or characterized by or inciting to mutiny
participating in organized resistance to a constituted government
having deserted a cause or principle
showing lack of love for your country
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adj inspired by love for your country
chauvinistic, flag-waving, jingoistic, nationalistic, superpatriotic, ultranationalistic