noun
A physical or metaphorical seal that closes something, such as a letter, container, or a magical seal.
手紙に封印をする。
I put a seal on the letter.
この箱には厳重な封印が施されている
This box has been tightly sealed.
noun or participle which takes 'suru', transitive verb, intransitive verb
seal; affix a seal; seal up
The act of sealing something, often with a physical stamp or wax, or metaphorically closing off access.
封筒を封印する。
I seal the envelope.
彼はその書類に封印をした。
He affixed a seal to the document.