In your main plugin file, use plugin_dir_path to define a constant that you can then use in all of your includes. see the example on the above codex page.
// define the constant in your main plugin file
define( 'MYPLUGINNAME_PATH', plugin_dir_path(__FILE__) );
then, to include your file:
include MYPLUGINNAME_PATH . 'includeme.php';
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