Employee engagement is not a new concept. Its roots are in "The Service Profit Chain" work from the late 1990s.
Everyone has a view about what engagement really is.
We don't get hung up on trying to force a definition.
We know (and you know) that engagement is important (see "why engagement matters")
We work with our clients to find ways to unlock levels of employee engagement to allow the individuals to flourish and the organisation to develop (and profit).