span Corey deVos February 5, 2017 The number of holons on any given level. While “span” refers to the horizontal dimension of a holon, “depth” refers to its vertical dimension (i.e., the number of levels within a holon). See depth. Related Articles: Depth & SpanTransforming Self, Society, and the Spaces Between Us“The Diplomat” Seeks the Bigger PictureInclusion & ExclusionFrom the Cambrian Explosion to the Human Explosion