Coalescence

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Noun: coalescence

1. The union of diverse things into one body or form or group; the growing together of parts

http://www.wordwebonline.com/en/COALESCENCE

coalesce

Pronunciation: "kO-&-'les

Function: verb

Inflected Form(s): co·a·lesced; co·a·lesc·ing

Etymology: Latin coalescere, from co- + alescere to grow -- more at OLD

intransitive verb

1 : to grow together

2 a : to unite into a whole : FUSE <separate> b : to unite for a common end : join forces <people>

3 : to arise from the combination of distinct elements <an>
transitive verb : to cause to unite <sometimes>

synonym see MIX

- co·a·les·cence /-'le-s&n(t)s/ noun

http://m-w.com/dictionary/coalesce

coalescence

Fusion of originally separate parts.

http://cancerweb.ncl.ac.uk/cgi-bin/omd?coalescence