The word **便是** is a classical Chinese compound formed through the grammaticalization and fusion of two distinct characters: the adverb **便** (biàn), meaning "then," "just," or "simply," and the verb/copula **是** (shì), meaning "to be" or "yes." Over time, in literary and formal contexts, they combined to function as a single, emphatic conjunctive phrase meaning "even if," "namely," or "precisely is," used to introduce a concessive clause or to strongly affirm and specify a statement, thereby carrying a more formal and weighty rhetorical force than the modern standalone "是."