Sustainability is a foundational pillar of Industry 5.0, shaping organizational competitiveness and talent attraction. Alongside structural changes, emerging technologies are transforming how sustainability is enacted, enabling more inclusive and responsible practices. Among its three dimensions–economic, environmental, and social–social sustainability remains the least explored in both research and practice. The SOSTAIN project addresses this gap by investigating how companies interpret and implement social sustainability in the workplace. As a first step, we conducted a preliminary study to explore how employees understand the concept. We surveyed 200 workers using an online questionnaire asking them to (1) list keywords they associate with social sustainability and (2) provide a personal definition. Through text mining and clustering techniques, we identified prevailing themes and conceptual associations. This employee-centered approach offers valuable insights into how the workforce conceptualizes social sustainability and lays the groundwork for developing inclusive, worker-informed strategies to support it in organizational settings.