Is there any way to mirror an entire Online Dictionary website?

You might try using kiwix.
It is in most distros.
The httrack tool may also be of interest.
I want to mirror to my local directory to read the definitions offline. Is there any way to do it with the wget command?
Yes, there is. Use this.
wget --mirror --convert-links --backup-converted \
     --html-extension -o /home/me/weeklog        \
wget -m -k -K -E -o /home/me/weeklog

You need to change values as per your use case, of course. It's all here
I don't suppose you have any idea how much data you're looking at if you download -- but it's probably more than you realize. It was definitely more than I expected. I tried using the wget code below, and it seemed to work fine, but I aborted it after 1 hour and 20 minutes. I have a pretty fast cable connection, but it may be slowed somewhat by my VPN. I have no idea whether the download would have completed in another minute, or another hour, or 10 hours. But you can see in my screen shot I got almost 61,000 files and folders (over 10 GB) when I quit. For a dictionary... Wow! :eek:

This will at least give you some pause for thought. If you have a good connection and no data caps, maybe you'll go for it until finished. Or you may want to consider some other options. ;)

And to be clear... my partial download was not functional. There's no guarantee that a full download would be functional either. There could be critical resources that do not download. Or maybe my wget command is not quite right... it came from some very old notes I have.

wget --no-clobber --no-parent --convert-links --random-wait -r -p -E -e robots=off -U mozilla


And inside the /us/ folder you'll find:
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