Terminology Services 4 NFDI (TS4NFDI) is a cross-domain service for the provision, curation, development, harmonization, and mapping of terminologies. It aims to facilitate consensus-building and interoperability of services across disciplines to achieve a shared knowledge representation and knowledge engineering framework. The service seeks to integrate and converge individual solutions into a standardized, interoperable, and sustainable service suite with Service Wrapper, API Gateway, mapping service, and reusable GUI widgets.