(1)权利(或特权)的终止(或失效)
指由于当事人在一定期限内疏于行使或由于某一不特定事件的发生或不发生，导致其权利或特权的终止。

(2)保险单的失效
投保人未按期缴纳保费，保险单依保险合同的有关约定而失效。在宽限期内(一般为30日或31日)，保险单可因补交保险费而继续有效。在宽限期内未能补交保险费而失效的保险单，可在复效期内因补足所欠保费并满足其他相应条件而复效。

(3)遗赠的失效
(=lapse of legacy or devise)

• administration de bonis non cum testamento annexo
• administration durante absentia
• administration durante animo vitio
• administration durante minoritate administratoris
• administration expense(s)
• administration letters
• administration minori aetate
• administration of estates
• administration pendente absentia
• administration pendente lite
• administration pendente minoritate executoris
• administration suit
• administration without probate
• administrative
• administrative act
• administrative adjudication
• administrative agency
• administrative appeal
• administrative assistants
• administrative authority
• administrative board
• administrative business
• administrative capacity
• administrative collateral estoppel
• administrative commission