https://webstersdictionary1828.com/

To go the better route, here's a HN post about adding Webster's 1913 to the macOS dictionary app (the dictionary is very good):

https://news.ycombinator.com/item?id=29733648

If anyone is aware of a .dict file to add Webster's New International Dictionary, Second Edition (1942) to the MacOS Dictionary app, please post! That would be the holy grail for me.

But the biggest problem with conventional dictionaries, whether paper or digital, is that they cannot tell you what a word means in the specific context in which you encountered it. If you come across the word canonical, to use the OP’s example, and you look it up in a dictionary, the dictionary won’t tell you whether, in the text you’re reading, it means “conforming to a general rule or acceptable procedure,” “of or relating to a member of the clergy,” “of, relating to, or forming a canon,” or something else.

Take the following instance of canonical, from a recent Ezra Klein podcast:

“One of the things I always think when I hear this argument about loneliness is I don’t think we’re online because we’re lonely — I think we’re lonely because we’re online. ... And the loneliness is partially a product there. Sometimes you’re lonely being online with people you know — the canonical kids texting their friends instead of hanging out in person. But I also think that, even for people who are not lonely online, there is something really disastrous about the politics it produces.” [1]

None of the definitions of canonical shown in the OP's screenshots, or in the other dictionaries I checked, matches that usage.

LLMs do much better. Here is what Gemini gave me:

https://g.co/gemini/share/156820176dba

And Claude:

https://claude.ai/share/7fb2aabd-fb29-439c-925a-c2d4b167b35e

[1] https://www.nytimes.com/2025/09/19/opinion/ezra-klein-podcas...