Coherent; well organized.
He's really together.
At the same time, in the same place; in close association or proximity.
We went to school together.
Into one place; into a single thing; combined.
He put all the parts together.
In a relationship or partnership, for example a business relationship or a romantic partnership.
Bob and Andy went into business together. Jenny and Mark have been together since they went on holiday to Mexico.
Without intermission or interruption; continuously; uninterruptedly.
It has been raining four days together