concomitance
noun
con·com·i·tance kən-ˈkä-mə-tən(t)s 
kän-
: accompaniment
especially : a conjunction that is regular and is marked by correlative variation of accompanying elements
Example Sentences
Recent Examples on the Web The researchers also looked at the role of such an increase in concomitance with unemployment. 
Annalisa Merelli, Quartz, 18 Jan. 2020
Annalisa Merelli, Quartz, 18 Jan. 2020 Word History
First Known Use
circa 1535, in the meaning defined above