Management is an art of getting things done through others. Do you think this definition is adequate for the present day concept of management?

Indeed, this conception of management is a valid one in my mind.  All forms of management require a commitment to organizational goals, but also necessitate the need to work with others.  The negotiation of both of these realities is of critical importance to the manager.  Failure in one realm could spell disaster in the other.  At some level, the definition encompasses all managers.  There are specific models of management that place primacy on one part over another, but at its core, all management has to understand the realities of interpersonal intelligence and focus on organizational goals and visions.  For example, if a manager believes in the delegation of responsibility, they would be more dependent on the idea of getting things done through others than one who embraces a traditional "top down" approach.  Yet, both have to, at some level, understand the need to get things done through others.