Reentrance is a term used in various fields such as engineering, architecture, and mathematics to describe the point at which a structure or pathway re-enters an enclosed area. The word reentrance has synonyms that can be used interchangeably in different contexts. Some examples include re-entry, return, reintroduction, comeback, re-emergence, reversion, and recurrence. When it pertains to architecture, reentrant can also be used to describe the inward curving of a corner of a building that creates a small inward angle. In summary, the choice of synonym for reentrance depends on the context in which it is used and the level of emphasis on the point of returning.