As I understand it, the most simple definition of a contemporary Kairos moment is: the moment at which the inborn Christological consciousness is instantiated as an active essential commission.
In adventist theology, the two perfect instances of Kairos were the birth of Christ, and, his resurrection.
(See: Myth, Faith, and History in the New Testament
Author(s): Paul L. Hammer
Journal of Bible and Religion, Vol. 29, No. 2 (Apr., 1961), pp. 113-118)
Meanwhile, it is notable that my colleague David A. Kolb’s constuctivist-cognitivist learning cycle echoes the schema of the Kairos moment.