The phrase "a mere window" is correct and usable in written English.
It can be used to describe something that is simply a window, often implying that it is not significant or that it serves a basic function.
Example: "In the grand scheme of the design, the glass structure was just a mere window to the outside world."
Alternatives: "just a window" or "simply a window".
No longer was it a mere window through which life and drama could be observed; now it was an opening through which they could be manipulated.
Could it be a mere window reflection?
The penitential rite at the beginning of Mass is not meant to be a mere window dressing.
While some might argue because of the high prices of items in Dubai malls, even a mere window shopping experience will make your stay worth the while.
As we have seen in the past, the browser has transcended its original function as a mere window to an infinite wealth of information, becoming a legitimate artistic medium in its own right.
Expect at least one Republican at State or Defense, an indication that bipartisanship in an Obama administration will not be mere window dressing.
Otherwise, the new campaign finance law will end up like the one it is supposed to strengthen -- mere window dressing for a political process that the American people often see as corrupt.
We had been assuming that Mr. Lieberman was, like another member of Mr. Gore's "short list," Gov. Jean Shaheen of New Hampshire, mere window dressing to humor a key Democratic constituency.
A mere, glass window stands between me and unbreathable air, but I'm not concerned.
A federal appeals court threw out a $1.4 million jury award to the pair, ruling they were mere window dressing to "gussy up" Mr. Trump's application for a gambling license.
Contrary to the argument that company-led initiatives are mere window dressing, this study provides a critical example of the positive role private governance mechanisms can play in improving environmental farm management practices globally.
