In
archaeology, a feature is any evidence of past human activity that is non-portable. A fire pit, a cache, and the outlines in the dirt showing where old postholes were dug are all features. (Large structures, like
mounds,
cromlechs, and
pyramids can be called either features or
artifacts, but usually are not called either).
Sometimes feature is also used to mean the context in which artifacts and ecofacts are found, or the arrangement of the items at a site, as these cannot be moved without altering them. But I believe that it is more common to use features to simply mean specific things, independent from the context in which they are found, and to use the word 'context' when talking about the context.