the act or an instance of omitting something : OMISSION

Pronunciation:
ih-LIZH-un

In a sentence:
The elision of his name on the roster offended and hurt Jacob, who was under the mistaken impression that he was a first string point guard, when in fact he was actually a schizophrenic loner named Steven.

In a different sentence:
Maria’s students noted the elision on the final exam of all questions pertaining to Pride and Prejudice—and also noted their teacher balling in the corner of the classroom with a roll of toilet paper and a water bottle full of cranberry juice and vodka in her hands.