Which preposition is proper here?
The protagonist died at/in the ending of the story (or movie).
The antagonist was laughing loudly at/in the ending of the movie.
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Sign up to join this communityThey all mean different things. "At the end" is chronological: the protagonist died at the time the movie ended.
"In the ending" has to do with the plot. In the ending, the protagonist fought mightily to defeat Godzilla and lost. He went out in a blaze of glory, much to the amusement of Godzilla who laughed loudly.
Now, you might say that the audience laughed loudly at the ending because it was so ridiculous. (In this case, "laughing at" the ending has the same context as laughing at a joke.) On the other hand, if you were to say that the audience laughed loudly at the end of the movie, it could be for any reason, not necessarily having to do with the movie itself.
The idiomatic phrase here is "at the end of" (note end rather than ending).
"In the ending" isn't incorrect; it's grammatical English. It's just not the most common way people refer to this.
As has been discussed in other questions, prepositions have myriad varied meanings and can be used in a lot of ways. Usually there is one option that is preferred as more idiomatic, but sometimes others could work just as well.