What is defined as "The means by which an organization increases involvement of its employees...

Comprehensive and Detailed In-Depth Explanation:

The definition provided in the question matches the APMG Change Management Foundation’s description of Engagement, which is the process of involving employees and stakeholders in change initiatives to build commitment and ownership. Engagement is a deliberate strategy to enhance participation and support, distinguishing it from roles like Change Agent (an individual facilitating change), Sponsor (a senior leader championing change), or Line Leader (a manager implementing change locally). The focus on "increasing involvement" aligns directly with Engagement as a foundational concept in stakeholder management.