immediacy
/ɪˈmiːdɪəsɪ/noun
mass noun
- the quality of bringing one into direct and instant involvement with something, giving rise to a sense of urgency or excitement直接性, 即刻性, 即时性：
electronic mail works because it has the immediacy of a scribbled memo.
电子邮件之所以成功是因为它有草写备忘录的即时性。