This comprehensive dictionary offers a systematic overview of synonyms, antonyms and related lexical relations in modern Italian, designed primarily as a reference for advanced users interested in refining vocabulary and understanding semantic distinctions. The volume is structured to present for each lemma not only general synonyms and opposites but also analogous, generic, specific, and inverse terms, with 207 special inserts of “reasoned synonymy” which examine semantic networks in depth. It contributes significantly to Italian lexical scholarship by offering a rich, nuanced mapping of lexical alternatives and contrasts, supporting language‑study, writing and editing practices. The approach is descriptive rather than prescriptive, highlighting usage registers and semantic gradations across a wide vocabulary.