I want to use my iPad to read PDFs of my textbooks. There are often vocabulary terms which I would like to create my own definition for and then be able to click on that word or phrase later in the PDF and see my definition.
This seems different from the standard note function which only puts the text in the location where it was defined. I looked through reviews of PDF readers and none of them mentioned specifically what I am looking for.
I am willing to pay up to $10 for this.
Is there an app that has what I am looking for?