Adjourning is the process of "unforming" the group, that is, letting go of the group structure and moving on. Adjourning refers to the team breaking up after the task has been completed. Transforming involves the team not breaking up but instead moving onto other tasks and objectives (from what I understand).
I found these stages of team development quite relevant. These stages can be cyclical once changes occur, such as the introduction of a new team member or the change of some other team variable that can modify how the team works. Some of you may be familiar with this model of group development but for those that aren’t I highly recommend that you take these phases into consideration and explore them within your current organizations.