@KatyElphinstone @fishidwardrobe @peterbrown
I can see some potential benefit in leaving the power differential out for a working definition.
While it's absolutely correct that this is a necessary part of bullying that there is a power differential, leaving this part out makes it much easier to claim for those being bullied. After all, this is not always a differential that would be easy to spot.
Abuse of this definition through the bully by clajming that in fact they were bullied may work once. But the second time, with a different person involved but the same bully, things will start looking dubitable.
Also, bullies could lose some of their informal power when claiming publicly that they were bullied because they put themselves in a victimized position (especially when that power is based on intimidating others).
This is not justice for individual cases. It can be abused. But so can a definition that includes the power differential when e.g. a team member bullies a higher rnaking team member who struggles with defending themselves emotionally. Then, the bully could claim it's not bullying where in fact it is - but the power differential is hidden.