noun
linkage; interrelation; co-movement
Abstract noun expressing that two or more things are linked, move together, or influence each other. Often used in technical, economic, or systemic contexts.
為替と株価の連動性が高まっている。
The linkage between exchange rates and stock prices is increasing.
このシステムでは各モジュールの連動性が重要だ。
In this system, the interconnectedness of each module is important.
相関 is 'correlation', often statistical; 連動性 is broader, including mechanical or systemic linkage.
Compound of 連動 (linkage, interlocking) + 性 (property, -ness).