seal (Noun) — (military) a member of a Naval Special Warfare unit who is trained for unconventional warfare. ex. "SEAL is an acronym for Sea Air and Land"
seal (Noun) — Fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters.
seal (Noun) — A device incised to make an impression; used to secure a closing or to authenticate documents.
seal (Noun) — The pelt or fur (especially the underfur) of a seal. ex. "a coat of seal"
seal (Noun) — A stamp affixed to a document (as to attest to its authenticity or to seal it). ex. "the warrant bore the sheriff's seal"
seal (Noun) — An indication of approved or superior status.
seal (Noun) — A finishing coat applied to exclude moisture.
seal (Noun) — Fastener that provides a tight and perfect closure.
seal (Noun) — Any of numerous marine mammals that come on shore to breed; chiefly of cold regions.
seal (Verb) — Make tight; secure against leakage. ex. "seal the windows"
seal (Verb) — Close with or as if with a seal. ex. "She sealed the letter with hot wax"
seal (Verb) — Decide irrevocably. ex. "sealing dooms"
seal (Verb) — Affix a seal to. ex. "seal the letter"
seal (Verb) — Cover with varnish.
seal (Verb) — Hunt seals.