As language technologies rapidly evolve, there is an urgent need for consistent and interoperable ways to represent lexical and terminological data. While ISO standards such as LMF and TMF provide robust frameworks individually, their coexistence has led to fragmentation in how dictionaries and terminological databases are developed and maintained. This paper is the first to offer a systematic proposal for a Unified Markup Framework (UMF) that bridges the gap between these two standards. By aligning LMF and TMF through a shared meta-model and real-world use cases, our work provides a timely solution to enhance interoperability across digital language resources. This has the potential to improve the efficiency and scalability of multilingual applications, including machine translation, language learning tools, and digital lexicography, ultimately making language data more accessible, reusable, and future-proof.