I have expertise neither in physics nor in theater. But I do want to chime in to suggest that any time you're about to make a categorical statement like "fresne

I have expertise neither in physics nor in theater. But I do want to chime in to suggest that any time you're about to make a categorical statement like "fresnel is not a noun" in response to someone using it that way, it's worth pausing. Regardless of your certainty, there's rarely a well-grounded reason to think your view is more correct than theirs. All language is contextual. Fields have jargon. And so many arguments on the internet arise when people from different contexts make unnecessarily strong statements insisting that their usage is correct. Instead, pause and consider whether there's a more valuable approach such as curiosity.