- 1 [countable] an official design or mark, stamped on a document to show that it is genuine and carries the authority of a particular person or organization The letter bore the president's seal. making something definite
- 2[singular] a thing that makes something definite The project has been given the government's seal of approval (= official approval). I looked upon the gift as a seal on our friendship. on containers
- 3 [countable] a substance, strip of material, etc. used to fill a crack so that air, liquid, etc. cannot get in or out a jar with a rubber seal in the lid Only drink bottled water and check the seal isn't broken. on letters/boxes
- 4[countable] a piece of wax (= a soft substance produced by bees ), soft metal or paper that is placed across the opening of something such as a letter or box and which has to be broken before the letter or box can be opened He broke the wax seal and unrolled the paper.
- 5[countable] a piece of metal, a ring, etc. with a design on it, used for stamping a wax or metal seal sea animal
- 6 [countable] a sea animal that eats fish and lives around coasts. There are many types of seal, some of which are hunted for their fur. a colony of seals grey seals basking on the rocks The annual seal hunt takes place on the pack ice off Greenland. See related entries: Wild mammals Word Originnoun senses 1 to 5 Middle English: from Old French seel (noun), seeler (verb), from Latin sigillum