Meaning of “seal” in the English Dictionary

"seal" in British English

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sealnoun [ C ]

uk /siːl/ us /siːl/

seal noun [ C ] (ANIMAL)

B2 a large mammal that eats fish and lives partly in the sea and partly on land or ice

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seal noun [ C ] (MARK)

an official mark on a document, sometimes made with wax, that shows that it is legal or has been officially approved:

The lawyer stamped the certificate with her seal.

sealverb [ T ]

uk /siːl/ us /siːl/

seal verb [ T ] (COVERING)

C2 to close an entrance or container so that nothing can enter or leave it

to cover a surface with a special liquid to protect it:

This floor has just been sealed (with varnish), so don't walk on it!

C2 to close a letter or parcel by sticking the edges together:

Seal the package (up) with tape.
He sealed (down) the envelope and put a stamp on it.

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seal verb [ T ] (MARK)

to make an agreement more certain or to approve it formally:

The two leaders sealed their agreement with a handshake.

Idiom(s)

Phrasal verb(s)

(Definition of “seal” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"seal" in American English

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sealnoun [ C ]

us /sil/

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.

sealverb [ T ]

us /sil/

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)

"seal" in Business English

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sealnoun [ C ]

uk /siːl/ us

an official mark on a document, sometimes made with wax, that shows that it is legal or has been officially approved:

The documents were marked with the official seal.

a thin piece of paper or plastic that covers the opening of a container and has to be broken before the contents can be used:

The seal on the bottle was broken.

something fixed around the edge of an opening to prevent liquid or gas flowing through it:

A video showed cracked seals and leaking water inside the coal mine.
under seal

LAW if something is under seal, it cannot be seen, copied, or taken away:

His file is currently under seal.

See also

sealverb [ T ]

uk /siːl/ us

to make an agreement more certain or to approve it formally:

seal sth with sth The loans are typically sealed with handshakes.

to close an entrance or container so that nothing can enter or leave it:

The doors are sealed.

to cover a surface with a special liquid in order to protect it:

seal sth with sth The office floors were sealed with varnish.

to close a letter or parcel by sticking the edges together:

seal down sth Seal down the envelope.

(Definition of “seal” from the Cambridge Business English Dictionary © Cambridge University Press)