1. In relation to word formation:
* Suffix: This is the most direct opposite. A suffix is added to the end of a word, while a prefix is added to the beginning. Examples:
* Prefix: "un-" in "unhappy"
* Suffix: "-ing" in "walking"
2. In relation to ordering:
* Postfix: This is a less common term, but it refers to something that comes after something else. It's the opposite of a "prefix" in terms of order, but it doesn't necessarily refer to word formation.
3. In relation to computer science:
* Postfix notation: This is a way of writing mathematical expressions where the operators come after the operands, as opposed to prefix notation where the operators come before the operands.
Ultimately, the best opposite for "prefix" depends on the specific context of your question.