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English definition of “seal”

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seal

noun [C]  /sil/ us  

seal noun [C] (ANIMAL)

a large, fish-eating mammal that has very thick fur and lives in the sea: Seals are sometimes hunted for their valuable fur.

seal noun [C] (OFFICIAL MARK)

an official mark on a document which shows that it is legal or actually what it claims to be: Diplomas are stamped with the state seal. A seal of approval means that something has been proven to be good or is very pleasing: My brother’s girlfriend got my mom’s seal of approval.

seal noun [C] (COVERING)

anything that prevents the escape of liquid or gas from a container or pipe: The oil seal broke, and all the oil leaked from the engine. Don’t use that jar of baby food if the seal is broken.

seal

verb [T]  /sil/ us  

seal verb [T] (CLOSE)

to close a container or opening, or to prevent the escape of a liquid or gas from something: Rubber seals jars tightly. He sealed the envelope and put a stamp on it. [M] Broiling with high heat seals in the flavor of the meat. [M] The police sealed off the area (= prevented people from entering it). If official documents are sealed, they cannot be seen or are not available to the public.

seal verb [T] (APPROVE)

to formally approve an agreement: They sealed the agreement with their signatures.
(Definition of seal from the Cambridge Academic Content Dictionary © Cambridge University Press)
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