A search on Google Books* reveals that enhabitation is a word coined by the sociologist Michael Billig.
Here are the thoughts that go through my mind as a fluent speaker when I see this new and unfamiliar word. (I wrote this before the paragraph with the context was added to the question. That paragraph removes the need to guess, but I think it helps a lot to see how a fluent speaker makes an educated guess about a new word.)
Is it a mistake for "inhabitation"? If it's deliberate, then someone probably invented it by drawing upon classical roots,* as is usual when making technical terminology. So, it's probably an obscure technical term.
The prefixes in- and en- both come from Latin in. En- is the French version, as in entrench, enfeeble, enable, etc. In English, we often choose en- instead of in- when coining a new word to mean "become" or "make" instead of "be inside". Or, it could be an obsolete French spelling.
The word habitus has previously been brought from Latin, where it means mode of dress as well as habit or the general condition of something (as in "a nun's habit"), into English scientific terminology, to mean things like an organism's overall way of life, a person's typical stance or demeanor, the common traits or beliefs or behaviors of a social group, and similar things.
If the context is sociology, I would guess that enhabitation is the process of acquiring the attitudes, manner of dress, etc. of a social group, by participation in life among that social group, so that they become unconscious, effortless, and feel like being yourself rather than a deliberate act or choice. The word could also mean the result of that process, as often happens with -tion words.
Indeed it appears that Billig coined the verb enhabit for the process of picking up a society's habitus. Most likely he means something more specific than the general guess that the roots suggest.
There are two lessons here for someone learning English:
If you can recognize roots of the word, like habit, look at their etymologies. Etymologies often provide clues to how people will draw upon the older, stabler meanings of roots to coin new words. Wiktionary makes this easy, since you can just follow the links to the classical root words, and from there follow the links to the English words that derive from them.
Google Books is one of the best places to search to see how a word or phrase is actually used, especially in formal writing. Real usage goes far beyond what dictionaries can document, of course.
* That is, words from Latin and Ancient Greek.