add a define command to define words

[ScottMansfield]

Add a simple command to define a word. There should be an API gopher can hit somewhere or an easy link it can return. Will update if I find something for either.

[theckman]

Would this be to help people who many not have English as their first language / are just unfamiliar with a term? Kinda like !define ternary operator or something?

[noxer]

I like the idea, perfect for #golang-newbies.

[theckman]

As long as Urban Dictionary is absolutely not part of the dataset, sure.

[theckman]

Would you mind re-raising this against https://github.com/gobridge/gopherbot for consideration? I'm going to be archiving this repo.