1. (n.)seal an embossed emblem, symbol, letter, etc., used as attestation or evidence of authenticity.
2. seal a stamp, medallion, ring, etc., engraved with such a device, for impressing paper, wax, lead, or the like.
3. seal the impression so obtained.
4. seal an authenticating mark or symbol, orig. wax with an impression, attached to a legal document.
5. seal a piece of wax or similar adhesive affixed to a document, envelope, door, etc., that must be broken when the object is opened.
6. seal anything that tightly or completely closes or secures a thing.
7. seal something that keeps a thing secret: Her vow was the seal that kept her silent.
8. seal a stamplike label, esp. as given to contributors to a charity: a Christmas seal.
9. seal a mark, sign, symbol, or the like, serving as visible evidence of something.
10. seal anything that serves as assurance, confirmation, or bond: She gave the plan her seal of approval.
11. seal Plumbing.
12. seal a small amount of water held by a trap to exclude foul gases from a sewer or the like.
13. (v.t.)seal to affix a seal to in authorization, testimony, etc.
14. seal to assure, confirm, or bind with or as if with a seal.
15. seal to impress a seal upon as evidence of legal or standard exactness, measure, quality, etc.
16. seal to close with a fastening that must be broken to gain access.
17. seal to fasten or close tightly by or as if by a seal.
18. seal to decide irrevocably: to seal someone's fate.
19. seal seal off,
20. seal to close hermetically.
21. seal to block all access to or from, with a policebarricade.
22. (n.)seal any of numerous marine carnivores of the order Pinnipedia, including the eared seals of the family Otariidae and the earless seals of the family Phocidae.
23. seal the skin of such an animal.
24. seal leather made from this skin.
25. seal the fur of the fur seal; sealskin.
26. seal a dark gray-brown.
27. (v.i.)seal to hunt, kill, or capture seals.
Etymology: (bef. 900; ME sele, OE seolh, c. OHG
Definition of 'Seal'
Princeton's WordNet
1. (noun)sealing wax, seal fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
2. (noun)seal, stamp a device incised to make an impression; used to secure a closing or to authenticate documents
3. (noun)seal, sealskin the pelt or fur (especially the underfur) of a seal "a coat of seal"
4. (noun)Navy SEAL, SEAL a member of a Naval Special Warfare unit who is trained for unconventional warfare "SEAL is an acronym for Sea Air and Land"
5. (noun)seal a stamp affixed to a document (as to attest to its authenticity or to seal it) "the warrant bore the sheriff's seal"
6. (noun)cachet, seal, seal of approval an indication of approved or superior status
7. (noun)seal a finishing coat applied to exclude moisture
8. (noun)seal fastener that provides a tight and perfect closure
9. (verb)seal any of numerous marine mammals that come on shore to breed; chiefly of cold regions
10. (verb)seal, seal off make tight; secure against leakage "seal the windows"
11. (verb)seal close with or as if with a seal "She sealed the letter with hot wax"
2. (noun)Seal an engraved or inscribed stamp, used for marking an impression in wax or other soft substance, to be attached to a document, or otherwise used by way of authentication or security
3. (noun)Seal wax, wafer, or other tenacious substance, set to an instrument, and impressed or stamped with a seal; as, to give a deed under hand and seal
4. (noun)Seal that which seals or fastens; esp., the wax or wafer placed on a letter or other closed paper, etc., to fasten it
5. (noun)Seal that which confirms, ratifies, or makes stable; that which authenticates; that which secures; assurance
6. (noun)Seal an arrangement for preventing the entrance or return of gas or air into a pipe, by which the open end of the pipe dips beneath the surface of water or other liquid, or a deep bend or sag in the pipe is filled with the liquid; a draintrap
7. (verb)Seal to set or affix a seal to; hence, to authenticate; to confirm; to ratify; to establish; as, to seal a deed
8. (verb)Seal to mark with a stamp, as an evidence of standard exactness, legal size, or merchantable quality; as, to seal weights and measures; to sealsilverware
9. (verb)Seal to fasten with a seal; to attach together with a wafer, wax, or other substancecausing adhesion; as, to seal a letter
10. (verb)Seal hence, to shut close; to keep close; to make fast; to keep secure or secret
11. (verb)Seal to fix, as a piece of iron in a wall, with cement, plaster, or the like
12. (verb)Seal to close by means of a seal; as, to seal a drainpipe with water. See 2d Seal, 5
13. (verb)Seal among the Mormons, to confirm or set apart as a second or additional wife
Definitions of Seal 
Afrikaans: seël
Arabic: خاتِم شَمْعي على الوثيقَه
Bulgarian: печат
Brazilian: selo
Czech: pečeť
German: das Siegel
Danish: segl
Greek: σφραγίδα
Spanish: sello
Estonian: pitser
Farsi: مهر
Finnish: sinetti
French: sceau
Hebrew: חוֹתָם
Hindi: मोहर, मुहर, मुद्रा
Croatian: žig
Hungarian: pecsét
Indonesian: lak, segel
Icelandic: innsigli
Italian: sigillo, timbro
Japanese: 封印
Korean: 표장
Lithuanian: antspaudas
Latvian: zīmogs
Malay: cap
Dutch: zegel
Norwegian: segl
Polish: pieczęć
Persian: مهر
Pashto: مهر
Portuguese: selo
Romanian: sigiliu
Russian: печать
Slovak: pečať, pečiatka
Slovenian: pečat
Serbian: pečat
Swedish: sigill, plomb[ering]
Thai: รอยประทับตราซึ่งติดอยู่กั
Turkish: mum, mühür
Taiwanese: 印章
Ukrainian: печатка; клеймо
Urdu: مہر
Vietnamese: dấu niêm phong
Chinese: 印章，印鉴，图章
