Also, I don’t think you understand how language works. The meanings of words do change over time and space. The same words can mean different things to different people. For example, what Americans call “fries” are called “chips” by the English. The inherent purpose of language is such that one person can communicate with another and understanding of intended meaning can be reached. The manner in which people are able to use specific words to convey meanings and ideas is fluid and not fixed, and miscommunication in a common occurrence in society as a result.
The original post did not specify whether or not watching a film without completely finishing it (yet) was acceptable. And the original poster also has not elaborated to support either front. I couldn’t think of what my then-penultimate-completely-watched-film was, so I posted a penultimate-mostly-watched-film instead. The word “seen” does not inherently convey what percentage of a movie must be experienced. Therefore, when I posted I said I hadn’t actually finished it yet. Now I have, but I haven’t watched another movie since watching it, so never you mind my opinion of it yet.