Here is a context clues worksheet on the noun annotation; I don’t know why I didn’t post it at the same time as this one on the verb annotate, which is used both intransitively and transitively.
I wrote these because I worked in a school in which students were assigned work compiling annotated bibliographies without ever learning what it means, as an act or academic practice, to annotate. I hope these help.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.