n.
Function: noun
Etymology: Middle English sele, seel, from Anglo-French seal, sel, from Latin sigillum seal, from diminutive of signum sign, seal ― more at SIGN
Date: 13th century
1 a : 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 (2) : 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 c : 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 d : a usually ornamental adhesive stamp that may be used to close a letter or package especially : one given in a fund-raising campaign
2 a : something that secures (as a wax seal on a document) b : a closure that must be broken to be opened and that thus reveals tampering c (1) : a tight and perfect closure (as against the passage of gas or water) (2) : a device to prevent the passage or return of gas or air into a pipe or container
3 : a seal that is a symbol or mark of office
– under seal : with an authenticating seal affixed