1.
loyalty, as of a subject to his sovereign or of a citizen to his country

2.
(in feudal society) the obligations of a vassal to his liege lord. See also fealty, homage (sense 2)

Word Origin
C14: from Old French ligeance, from lige liege

Synonyms
View thesaurus entry
= loyalty, duty, obligation, devotion, fidelity, homage, obedience, adherence, constancy, faithfulness, troth (archaic), fealty

Translations for ‘allegiance’
British English: allegiance Your allegiance is your support for and loyalty to a particular group, person, or belief. NOUN…my allegiance to the company

http://www.collinsdictionary.com/dictionary/english/allegiance#