coaction

noun

co·​ac·​tion ˌkō-ˈak-shən 

variants or co-action

plural coactions or co-actions

: joint or concurrent action

To be sure, in a prophetic paper the British mathematician Yule (1902: 234-235) had suggested that continuous variation might be due to the coaction of multiple factors.

—Ernst Mayer

Word History

First Known Use

1625, in the meaning defined above