Final answer:
An omission in a sentence indicates something has been left out, such as in an ellipsis used for omitted words within quotations or an elision in poetry. It is important to retain the original meaning despite omissions.
Step-by-step explanation:
An omission in a sentence typically indicates that something has been left out. This can occur deliberately, for a variety of reasons such as brevity or stylistic effect. For instance, when quoting text, an ellipsis ([...]) is commonly used to signify the omission of words from the original quote, ensuring the altered quote fits contextually within the new writing without changing its intended meaning. It is crucial not to distort the original meaning when omitting text.
Elision is a poetic and literary tool where part of a word, often a syllable, is omitted to maintain the metric integrity of a line, as seen in poetry. An apostrophe is often used in contractions to indicate omitted letters, signaling the fusion of two words into one contracted form.