Alternity refers to the state of being alternate, a deviation from the norm or a departure from convention. Some synonyms for alternity include diversity, variety, variation, and dissimilarity. These words all suggest something different or distinct. Another synonym is uniqueness, which implies a one-of-a-kind quality. Ambiguity is another word that is often used as a synonym, as it suggests a lack of clarity or certainty. Additionally, aberration, nonconformity, and anomaly are synonyms for alternity that suggest a departure from a norm or a common standard. Whatever word you choose, alternity connotes something that is distinct or different from what is expected, accepted, or normal.