Synthesis

[sin-thuh-sis] 
nounplural syntheses 

 [sin-thuh-seez] 

the combining of the constituent elements of separate material
or abstract entities into a single or unified entity.
Biology, Modern synthesis:
a consolidation of the results of various lines of investigation from the 1920s through the 1950s that supported and reconiled the Darwinian theory of evolution and theMendelian laws of inheritance in terms of natural selection acting on genetic variation.