I'm thinking of the Day of Pentecost, when they were all "in one accord and in one place", and had been praying together for many, many days, as the greatest example of how revival can take place.
Acts 1:14 "These all continued with one accord in prayer and supplication, with the women and Mary the mother of Jesus, and with his brethren"
Acts 2:1 "And when the day of Pentecost was fully come, they were all with one accord in one place."
So my definition of revival, according to the above passages:
Revival will happen when all are in one accord in one place.
So yes.... PO... unity is the best "context" here! (imo)