simple past tense and past participle of seal
"The envelope was sealed before it went into the mailbox."
In plain English: To seal something means to close it tightly so nothing can get in or out.
"She sealed the letter with an adhesive strip before putting it in the mail."
closed or secured with or as if with a seal
"my lips are sealed"
"the package is still sealed"
"the premises are sealed"
having been paved
"The newly sealed road shone wet and smooth under the morning sun after the crew finished laying fresh asphalt."
Closed by a seal.
"The envelope was sealed with red wax before being mailed to his grandmother."
In plain English: Sealed means closed tightly so nothing can get in or out.
"He kept the letter in a sealed envelope to keep it safe."
Derived from Old English sealan, this past participle originally meant to close up with wax or lead, specifically referring to the act of affixing an official seal to document authenticity. The term later expanded to denote any state of being shut tight or confirmed formally.