"In advance" is a commonly used phrase that implies that something is happening or being done ahead of time. However, there are several other phrases that can be used as a synonym for this term. Some popular ones include "ahead of time", "beforehand", "previously", "earlier", "proactively", and "anticipatorily." Each of these phrases carries the same connotation as "in advance" and can be used interchangeably depending on the context. Knowing these synonyms can help add variety and depth to your writing or speech while still conveying the same meaning effectively.