Concursion is the plural form of the word concur. If there is more than one person agreeing on an idea, the correct word would be "concursion."
In speaking to the rest of the group, we have concursion that this is the proper way to move forward.
An agreement upon agreeing, upon which you agree.
-"This evening has been phantasmagorical."
-"Thank you for hanging out with me. It really has been."