seal

: something that confirms, ratifies, or makes secure : GUARANTEE, ASSURANCE
b
(1)
: a device with a cut or raised emblem, symbol, or word used especially to certify a signature or authenticate a document

: a medallion or ring face bearing such a device incised so that it can be impressed on wax or moist clay
also : a piece of wax or a wafer bearing such an impression

: an impression, device, or mark given the effect of a common-law seal by statute law or by American local custom recognized by judicial decision

: a usually ornamental adhesive stamp that may be used to close a letter or package
especially : one given in a fund-raising campaign

: something that secures (such as a wax seal on a document)

: a closure that must be broken to be opened and that thus reveals tampering

: a tight and perfect closure (as against the passage of gas or water)

: a device to prevent the passage or return of gas or air into a pipe or container

: a seal that is a s