"Thank God!"

[Edwardo Piet]

Absolutely, though it must be noted that dictionaries only record usage; they do not in themselves define words.

Words can be re-defined and they were also defined prior to the existence of dictionaries, but dictionaries are nonetheless examples of definitions that people have made, are they not? I'm neither claiming that dictionary definitions are absolute or static definitions, I'm just saying: they're still definitions, and they're typical and useful ones, at least for the time being. From a philosophical perspective we do often have to go a lot deeper than dictionaries with our definitions though, indeed.