It would awesome if you could have the option of the definition showing up only one time per page in case you use the same word more than once on a page/post. For example: If I am defining the word "wordpress" and us it several times on a page/post, I would like the definition of the word "wordpress" only once and not each time "wordpress" is used. Sometimes there is no need to repeat the definition.
Otherwise the plugin is perfect. Nice work!