identity
UK: aɪˈdɛntɪti | US: aɪˈdɛntəti
n. the fact of being who or what a person or thing is
n. a close similarity or affinity between two or more things
n. (mathematics) an equation that is true for all values of its variables
The word "identity" originates from the Latin identitas, derived from idem (meaning "the same"). The morpheme ident preserves the core idea of sameness, while the suffix -ity forms an abstract noun, turning the concept into a state or quality. Over time, "identity" evolved from a purely logical or mathematical notion (e.g., "A = A") to encompass personal and social dimensions, reflecting the continuity of self or shared characteristics.
She struggled with her cultural identity after moving abroad.
The identity of the suspect was confirmed through fingerprints.
The two paintings share an identity of style despite being from different eras.
In algebra, the equation x + 0 = x demonstrates the additive identity.
The company rebranded to emphasize its identity as an eco-friendly business.