- 1[countable] a round glass container, with a lid, used for storing food a storage jar
- 2[countable] a jar and what it contains a jar of coffee
- 3[countable] a tall container with a wide mouth, with or without handles, used in the past for carrying water, etc. a water jar see also bell jar
- 4[singular] an unpleasant shock, especially from two things being suddenly shaken or hit The fall gave him a nasty jar.