nerd = bookworm or technical addict?

Missing important context: who said it, where and when:

Stephen Chu, (US Energy Secretary, former professor of physics, Nobel prizewinner)

Harvard University Commencement Speech to students

June 4 2009

There, I fixed that for you.

Your habit of using equals signs in your questions may betray a significant limitation in your comprehension, which is that you think that every word or phrase may be exactly replaced by another. Or maybe it is just shorthand for "Can thing A mean thing B?"

The word "nerd" has a number of possible meanings, depending on context and who is applying the label to whom. It generally means somebody who is perceived to have more knowledge than average about some subject considered difficult by ordinary people such as mathematics, computer science, or physics. Sometimes it means a person with low social skills obsessed with a scientific or technical subject, often showing signs of Asperger's Syndrome. Or it can just mean somebody who is interested in computers.

Thanks for the fixing.

But no such habit exists. I knew I could get a bunch of definitions about nerd from urban dict online. Making such a title of a thread is a way for convenience and efficiency.

If you ask me why have you asked here when urban dict has answers, it is because the speaker is a Nobel laureate and I have to be more careful to catch the exact meaning of a word he used.

And you've given me a good explanation.