Identical ancestors point
MOST RECENT POINT IN A GIVEN POPULATION'S PAST SUCH THAT EACH INDIVIDUAL ALIVE AT THIS POINT EITHER HAS NO LIVING DESCENDANTS, OR IS THE ANCESTOR OF EVERY INDIVIDUAL ALIVE IN THE PRESENT
Identical Ancestor Point
In genetic genealogy, the identical ancestors point (IAP), or all common ancestors (ACA) point, or genetic isopoint, is the most recent point in a given population's past such that each individual alive at this point either has no living descendants, or is the ancestor of every individual alive in the present. This point lies further in the past than the population's most recent common ancestor (MRCA).