Interesting observation: my first language is Polish, and we'd use the same word for accuracy and precision ("dokładność").
* https://centrumdruku3d.pl/jak-zrozumiec-roznice-pomiedzy-dok...
* https://automatykab2b.pl/technika/54301-dokladnosc-i-precyzj...
* https://learn.microsoft.com/pl-pl/office/troubleshoot/access...
* https://pl.wikipedia.org/wiki/Dok%C5%82adno%C5%9B%C4%87_i_pr...
etc.
Here's an image that explains the difference pretty succintly: https://www.antarcticglaciers.org/wp-content/uploads/2013/11...
> efficacy /ĕf′ĭ-kə-sē/
> Power or capacity to produce a desired effect; effectiveness.