What is the meaning of the prefix "infra"?

The prefix "infra" means "below." This prefix is derived from Latin, where it has historically been used to indicate something that is situated at a lower level or beneath something else. In various contexts, such as in science, literature, and even legal terminology, it denotes a position or state that is beneath a certain reference point.

For instance, in anatomy, "infrapatellar" refers to a location that is below the patella (kneecap). In a more general context, "infrastructure" refers to systems and services that support a community or organization, which can be thought of as foundational elements that are below the surface of visible operations.

In contrast, the other prefixes provided do not carry the same meaning. "All" does not denote a positional context, "new" indicates something recent or being introduced, and "beside" refers to proximity rather than an underneath position.