An omission in a sentence indicates something that has been left out. It can suggest that certain information, details, or elements are missing, which may lead to ambiguity or an incomplete understanding of the message being conveyed.
As for a pause in a sentence, it often serves to create emphasis, indicate a change in thought, allow the reader or listener time to absorb information, or separate ideas for clarity. Pauses can be indicated through punctuation such as commas, periods, or dashes, affecting the rhythm and flow of the sentence.