Definition of "Seal" :
noun: any of numerous marine mammals that come on shore to breed; chiefly of cold regions
noun: a device incised to make an impression; used to secure a closing or to authenticate documents
noun: fastener that provides a tight and perfect closure
noun: a finishing coat applied to exclude moisture
noun: fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
noun: an indication of approved or superior status
noun: a stamp affixed to a document (as to attest to its authenticity or to seal it)
"The warrant bore the sheriff's seal."
noun: a member of a Naval Special Warfare unit who is trained for unconventional warfare
"SEAL is an acronym for Sea Air and Land."
noun: the pelt or fur (especially the underfur) of a seal
"A coat of seal."
verb: decide irrevocably
verb: hunt seals
verb: cover with varnish
verb: close with or as if with a seal
"She sealed the letter with hot wax."
verb: make tight; secure against leakage
"Seal the windows."
verb: affix a seal to
"Seal the letter."