noun, noun or participle which takes 'suru', transitive verb
opening; breaking the seal
Used for opening something that has been sealed or closed, especially letters, envelopes, parcels, official documents, or packages. As a suru verb, the object is marked with を.
封筒を開封する前に、宛名を確認してください。
Before opening the envelope, please check the addressee.
This document must not be opened by anyone other than the person concerned.
noun, noun or participle which takes 'suru', transitive verb
unboxing; opening a product package
A product-focused extension, common for newly bought goods and online content such as 開封動画. It emphasizes opening the packaging for the first time rather than merely opening a container.
新しいスマホを家に帰ってすぐ開封した。
I unboxed the new smartphone as soon as I got home.
彼女は化粧品の開封動画を投稿している。
She posts unboxing videos of cosmetics.
noun
unsealed mail
A limited postal or administrative noun use referring to mail that is not sealed or is treated as open. In ordinary conversation, people usually describe the state more explicitly, such as 封をしていない郵便物.
郵便の説明で「開封」は、封をしていない郵便物を指すことがある。
In postal explanations, 開封 can refer to mail that is not sealed.