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Synonyms for Unity (same or very similar meaning)

WordNet sense 1 (an undivided or unbroken completeness or totality with nothing wanting):
integrity, wholeness

WordNet sense 2 (the smallest whole number or a numeral representing this number):
ace, one, single, I

WordNet sense 3 (the quality of being united into one):
oneness


From the ODE community, based on WordNetadd/edit