plural jackets
1
: a piece of clothing that is worn on your upper body over another piece of clothing (such as a shirt) : a usually short and light coat
a suit with a double-breasted jacket
a warm jacket
2
: an outer covering: such as
a
: a paper cover that protects a book and that can be removed : dust jacket
b
chiefly US
: a paper, cardboard, or plastic envelope for holding a record, CD, or DVD
called also sleeve
Cite this Entry
“Jacket.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/jacket. Accessed 17 Jun. 2026.
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