noun
Abstract noun referring to the state or quality of being continuous, unbroken, or connected over time or space.
この計画には連続性が欠けている。
This plan lacks continuity.
歴史の連続性を理解することが大切
It is important to understand the continuity of history.
継続性 also means 'continuity', but often implies persistence or sustainability over time, whereas 連続性 can refer to an unbroken sequence or connection.
Compound of 連続 (continuation) + 性 (nature, property). The exact historical derivation is uncertain, but the word follows a common pattern for forming abstract nouns in modern Japanese.