Is There a Way to Create a Global Variable Repository

This may have a simple answer but I would like to store all the variables I’ve declared ( or cached ) across my theme in a central file and serve then this file globally ( Similar to how get_header(), get_footer() and get_sidebar() works ).

For this particular project, it would be more convenient if the multitude of variables I’ve created across my theme were housed in a central location in lieu of being scattered throughout various theme files.

I’ve tried creating a file called variables.php and serving it via get_template_part but without success.

Is there a idiomatic way of accomplishing this in WordPress?