Which prefix indicates the concept of 'out' or 'out of'?

The prefix that indicates the concept of 'out' or 'out of' is "ex." This prefix is derived from Latin, where it often signifies motion or direction from the inside to the outside, suggesting a sense of removal, separation, or exit. For instance, in words like "exclude" (to shut out) and "exhale" (to breathe out), the prefix highlights the action of moving out of a certain place or condition.

In contrast, the other prefixes have different meanings. "Hemi" refers to half, often used in terms like "hemisphere." "Infra" means below or beneath, commonly seen in terms such as "infrastructure." "Pan" indicates all or everything, used in contexts such as "panorama" (a view of all). Each of these prefixes conveys a specific concept that does not align with the idea of 'out' or 'out of' that "ex" encapsulates.