Intersubjectivity is a social science, psychology and linguistic term...At its heart born of philosophy. It refers to a broad range of human interaction centered around shared agreement, understanding, perspectives and assumptions.
A whopper of a concept really. I've figured out the easiest way to understand it.
The tendrils of minds spilling over into the world.
Our shared agreement with others over the very words I'm typing up right now, the way your mind slithers out and engages with the world, the way you may attribute feelings or beliefs to me - the writer - based on your prior experiences or perspectives.
The more widely used (but less artistic and philosophical ) definition is to refer to people agreeing about something.
"There is intersubjectivity between the christians and catholics on the question of..."
"There is agreement between the christians and catholics on the question of..."
"There is intersubjectivity between Amy and Joe's interpretation of the conflict in the middle east"
"There is an agreement of perspective between Amy and Joe's interpretation of the conflict in the middle east"