This article explores lexicalization as a fundamental, dynamic process in Romanian vocabulary enrichment, emphasizing that it is not a separate mechanism of word formation but an outcome of various internal procedures such as derivation, compounding, conversion, semantic specialization, and contamination. Lexicalization is defined as the diachronic transition from analyzable syntactic or grammatical constructions to stable, autonomous lexical units with consistent form and meaning. The article distinguishes between formal and semantic lexicalization and analyzes how gradual institutionalization and usage lead to complete or partial integration of new words and idiomatic expressions into the lexicon. Ultimately, lexicalization serves to diversify the vocabulary, resolve ambiguities, and reflect evolving communicative norms, acting as a collaborative effect of multiple linguistic processes rather than a distinct method.