n.
Function: transitive verb
Date: 14th century
1 a : to confirm or make secure by or as if by a seal < seal the deal> b : to solemnize for eternity (as a marriage) by a Mormon rite
2 a : to set or affix an authenticating seal to also : AUTHENTICATE , RATIFY b : to mark with a stamp or seal usually as an evidence of standard exactness, legal size, weight, or capacity, or merchantable quality
3 a : to fasten with or as if with a seal to prevent tampering b : to close or make secure against access, leakage, or passage by a fastening or coating c : to fix in position or close breaks in with a filling (as of plaster)
4 : to determine irrevocably or indisputably <that answer seal ed our fate>