1.
operability; ease of use; usability; handling
How easy or comfortable something is to operate or control. Used for devices, software, vehicles, tools, and other things that a user interacts with.
このアプリは操作性がいい。
This app has good usability.
操作性を重視して設計された製品だ。
It's a product designed with an emphasis on ease of use.
デザインは美しいが、操作性の面ではまだ改善の余地がある。
The design is beautiful, but there is still room for improvement in terms of usability.
Common collocations: 操作性がいい/悪い (good/poor operability), 操作性に優れる (to excel in usability), 操作性を向上させる (to improve usability). The suffix ～性 creates nouns expressing a quality or property: 安全性 (safety), 利便性 (convenience), 耐久性 (durability). Widely used in product reviews, tech discussions, and UI/UX contexts. Related: 使いやすさ (ease of use — more colloquial), ユーザビリティ (usability — the loanword, used in IT contexts).