In a way that shows faithful support and commitment to a person, group, or cause.
From 'loyal' (Old French 'loial,' from Latin 'legalis,' legal or according to law). The '-ly' forms an adverb. Loyalty originally meant 'legal obligation' but evolved to mean devoted faithfulness.
Loyalty comes from the Latin word for 'law'—because in feudal times, being loyal to your lord was literally a legal requirement written into the social contract!
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