LATIN DICTIONARYLexicon Latīnum
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“allegiance” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

allegiance
obedientia: fidelitas: fides. To retain anybody in his allegiance, aliquem in officio retinere: aliquem in ditione atque servitute tenere (if the subject of a despotic monarch orgovernment): to swear allegiance to, in verba alicujus or in nomen alicujus jurara (to take an oath offidelity: of citizens, magistrates, soldiers, etc.): in obsequium alicujus jurara (to swear obedience: of persons holding places of high trust; e.g., commanders-in-chief, Justinus, 13, 2, 14): aliquem venerantes regem consalutare (to salute or acknowledge as king: of Eastern nations, Tac.).

Quick answer

What is the Latin word for allegiance?
The usual Latin words for “allegiance” are fidēlitās, fidēs, Iūstīnus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.