A name (as in Fidel Castro), or in rare usage, an adjective meaning 'faithful' derived from Latin 'fidelis' (the root also gives English 'fidelity').
From Latin 'fidelis' meaning 'faithful' or 'loyal,' derived from 'fides' (faith, trust). As a given name, it reflects this meaning of loyalty. The Latin root also produces 'fidelity,' 'infidelity,' and 'confident.'
The name 'Fidel' literally means 'faithful'—which is deeply ironic given Fidel Castro's complicated historical legacy! The same Latin root 'fides' appears in 'fidelity' (loyalty) and 'fiduciary' (financial trustee), connecting trust and faith across centuries.
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