English word coadjacent comes from English adjacent, English co-
| Dictionary entry | Language | Definition |
|---|---|---|
| adjacent | English (eng) | Something that lies next to something else, especially the side of a right triangle that is neither the hypotenuse nor the opposite. (US) Next to; adjacent to; beside. Just before, after, or facing.. Lying next to, close, or contiguous; neighboring; bordering on. |
| co- | English (eng) | (mathematics) of the opposite, of the counterpart; dual. Partner or subordinate in an activity. To the same degree. Together; mutually; jointly. |
| coadjacent | English (eng) | Mutually adjacent; contiguous. |