Even Google snippet put the lexico page as its reference:

Click that link, and you will be redirected to
https://www.lexico.com/en/definition/cryptocurrencyIn a real-world situation, copy-paste verbatim should follow citation rules, such as IEEE/APA/MLA/Chicago, etc. Hence, what you did is undoubtedly plagiarism in academics institutions.
For non-academics, you might get away with a simple mention. In this case, mention the "Oxford Dictionary" or "Lexico."
You didn't do any of that.