Adjoiningness is the state of being adjacent or neighboring something else. Synonyms for this word include proximity, contiguity, or adjacency. These words convey the idea of something being close or touching something else. Other related synonyms include juxtaposition, nearness, and next-doorness. Adjoiningness can also be described as being in an adjoining position, and synonyms for this include being side-by-side, abutting, or bordering. These words indicate that something is directly next to another thing, without any separation or gap between them. Overall, there are many synonyms that can be used to describe adjoiningness, each of which conveys slightly different nuances and shades of meaning.