What is the prefix word for expected?

There isn't a single prefix word for "expected". However, depending on the context, you could use various prefixes to create related words:

* Anticipated: This implies a feeling of looking forward to something or believing it will happen.

* Pre-: This suggests something that happens before the expected event.

* Fore-: Similar to "pre-", it implies prior knowledge or prediction.

* Un-: This negates the expectation, making it unexpected.

* Over-: This implies exceeding the expected amount or level.

* Under-: This implies falling short of the expected amount or level.

The most appropriate prefix would depend on the specific meaning you want to convey.