noun
up-to-dateness; currency; currentness
Abstract noun referring to the quality of being current or up-to-date. Often used in technical or formal contexts such as information science, data management, or news reporting.
データベースの最新性を保つために、定期的な更新が必要だ。
Regular updates are necessary to maintain the currency of the database.
このニュースサイトは情報の最新性にこだわっている。
This news site is particular about the up-to-dateness of its information.
新しさ is a more general word for 'newness', whereas 最新性 specifically emphasizes being current or up-to-date in a temporal sense.
Compound of 最新 (latest, newest) and the suffix 性 (-ness, -ity), forming an abstract noun meaning 'up-to-dateness'.