The shortest way is to load wp-load.php and abort the loading of the template engine (Note: You couldn’t do that, if you’d be loading the header file, like you see it on many sites in the interweb).
# No need for the template engine
define( 'WP_USE_THEMES', false );
# Load WordPress Core
// Assuming we're in a subdir: "~/wp-content/plugins/current_dir"
require_once( '../../../wp-load.php' );
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