noun
reachability
Technical term in computing and graph theory, referring to whether a node or state can be reached from another.
このグラフでは、ノードAからノードBへの到達性が保証されていない。
In this graph, reachability from node A to node B is not guaranteed.
到達性解析はネットワークの設計に重要だ。
Reachability analysis is important for network design.
Compound of 到達 (arrival, reaching) and the suffix 性 (-ness, property). The exact historical derivation is uncertain, but the word is a modern technical coinage.