Equipollence is a formal word that means equality in weight, force or meaning. There are many synonyms for this word, such as equivalence, parity, similarity, correspondence, identity, sameness, balance, and symmetry. The word equivalence refers to two things that are equal in value, meaning or significance. Parity refers to the state of being even, equal or equivalent. Similarity means the quality of being alike in form, nature, or appearance. Correspondence is used to express similarity or agreement between two things. Identity refers to the state of being identical or the same in all respects. Sameness means the state of being similar, without difference. Balance and symmetry refer to the state of being in proportion and having equal weight or measure.