Very few people are comfortable admiting that they don't understand something. As a teacher, I deal with this all the time. As a former Engineering Manager, I know first-hand that an engineer is usually very reluctant to admit that they don't understand what you are talking about.
As with most engineering disciplines, embedded systems designers have their own language. What we didn't have, until now, was a dictionary for the language. "Embedded Systems Dictionary" is the book that every Embedded Systems Engineer should have at their desk, even if they cover it in a plain brown wrapper.
As with any dictionary, you will not get an extensive discourse on a word or term that is puzzling you. However, you will get a really good starting point so that you can do some extensive research later. In fact, I noticed that a number of the entries also included references as well.
As I read through the book I was really impressed by the completeness of it. I was able to come up with only one term, "n-wire", that wasn't included included.
Finally, two very minor quibbles. I found a few explanations that were as arcane as the concept that they were trying to define ( see "H-infinity filter" ) and a few that were so basic ( "average" ) you have to wonder.
In summary, this is a much-needed text for a technical subject area that has more than its share of jargon. I highly recommend it.