IPA: /nɒnəˈdʒeɪsənt/
KK: /nɑnəˈdʒeɪsənt/
Not next to or touching something else; separated by one or more things.
The two buildings are nonadjacent, separated by a park.
Nonadjacent → It is formed from "non-" (meaning not) and "adjacent" (from Latin "adjacens", meaning lying near or next to). The word "nonadjacent" means not lying next to or near something else.
Think of 'not' ('non-') being used to describe things that are 'next to each other' ('adjacent') — that's why nonadjacent means they are not next to each other.