mergence

plural mergences

1. countableuncountableThe act of merging.

   […] and that by the possession of a central cell in some of the species there is indicated a mergence from Fasciculophyllum into the genus Centrocellulosum--a relationship which it is now my province to trace.

   1883, James Thomson, On the Development and Generic Relation of the Corals of the Carboniferous System of Scotland

   1 more example

   In fact, in Lawrence's prose, we see clearly that there is not a mergence of two into one, but on the contrary, an existential distance that allows us to awaken both to the wonders of being alive and to our interconnectedness to the whole of Nature.

   2010, Maxine Sheets-Johnstone, The Roots of Morality, page 330