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Actually, this is a Client Script

Does your script have any client script entry points, e.g., pageInit, fieldChanged, etc.?

No, this is a Custom Module

I see

I need a named function since this latter is being called from a Suitelet-Popup; I use

window.opener.flx_cs_quore_lib().quoteRetrieval("Hello");

If I use an anyonymous function I don't have a way of identifying the function to be executed

You have this problem only when you call your function directly?

window.opener.flx_cs_quore_lib()

Calling define doesn't permanently provide a netsuite module to your function. The netsuite modules will only be passed to your function when define is called by the netsuite amd module loader, or when you call require. Change your function to do this

function quoteRetrieval(response) {
  require(['N/currentRecord'], function(currentRecord) {
    var rec = currentRecord.get();
     // rest of your code
  });
}

Let me give a shot @jkabot!