Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “seal”

See all translations

seal

noun [C]
 
 
/siːl/
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 company seal
(Definition of seal noun from the Cambridge Business English Dictionary © Cambridge University Press)
What is the pronunciation of seal?
Add Cambridge dictionaries to your browser to your website

Definitions of “seal” in other dictionaries

Word of the Day

exercise

physical activity that you do to make your body strong and healthy

Word of the Day

Byronic, Orwellian and Darwinian: adjectives from names.

by Liz Walter,
April 15, 2015
Becoming an adjective is a strange kind of memorial, but it is often a sign of a person having had real influence on the world. Science is full of examples, from Hippocrates, the Greek medic born around 460 BC, who gave his name to the Hippocratic Oath still used by doctors today,

Read More 

bio-inspiration noun

April 13, 2015
the adoption of patterns and structures found in nature for the purposes of engineering, manufacturing, science, etc. The MIT researchers actually aren’t the only robotics team to turn to cheetahs for bio-inspiration.

Read More