General Antonyms:
* Conclusion: This is the opposite of an introduction in terms of placement within a piece of writing or speech.
* Ending: Similar to conclusion, this refers to the final part of something.
* Departure: This suggests the act of leaving or going away, the opposite of arrival or beginning.
* Termination: This implies the ending or cessation of something.
Contextual Antonyms:
* Dismissal: If "introduction" refers to a formal presentation, dismissal would be the opposite.
* Rejection: If "introduction" refers to acceptance or welcoming, rejection would be the opposite.
* Exclusion: If "introduction" refers to including someone or something, exclusion would be the opposite.
More specific antonyms:
* Omission: If "introduction" refers to the act of presenting something, omission would be the opposite.
* Removal: If "introduction" refers to the act of bringing something in, removal would be the opposite.
To determine the most appropriate antonym, consider the specific context in which "introduction" is used.