annexe

Imagine an old house needing more room. Instead of rebuilding the whole thing, they add on an annexe—a separate building or wing attached to or near the main one. That's the most common image. But an annexe isn't always brick-and-mortar. It can also be a supplementary section added to a document or report; think of it as an appendix with extra details or supporting data. Sometimes, especially in British English, the term can describe any secondary building used for a specific purpose near a main site. Essentially, an annexe is something added on, physically or figuratively, to expand or supplement what already exists.

The word annexe (pronounced "AN-eks") comes from French and originally referred to something attached or added on. In American English, the spelling annex is more common for these noun senses. Today, it retains that core meaning of an extension—most often a separate structure joined to or associated with a main building. Think of a library adding a children's annexe for story time, or a hospital constructing an annexe to house new medical equipment.

However, the word has broadened in usage. In formal writing, international treaties, and publishing, an annexe can be a supplementary section attached to a document. While similar to an appendix, it often holds supporting material such as charts, tables, or technical data. For example: "The detailed financial breakdown is available in the annexe at the end of this report."

It's also easy to confuse annexe with annex. The verb to annex means to take control of territory, and the noun annex can refer to territory that has been added (often by force) to a larger state. That political sense is usually spelled annex; annexe is most commonly used for the building and document meanings.

So, whether it's a physical extension to a building or extra information attached to a report, an annexe is something added on to enhance or expand a primary thing. It's about providing more space or detail—literally or figuratively.