A cap is a hat that fits snugly on your head. You might wear a bathing cap when you swim, to keep your hair dry.

Many caps don't have brims, while hats often do. You can even describe someone's hair using the word cap: "She has a glossy cap of dark hair." Another kind of cap is a lid: "Put the cap back on the ginger ale or it'll go flat!" And to cap is to limit, as when a school caps the number of students at 500. The root is the Latin word caput, or "head."

Primary Meanings of cap

a tight-fitting headdress
lie at the top of
an upper limit on what is allowed
restrict the number or amount of
a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive
Full Definitions of cap

n a tight-fitting headdress

show 31 types...
hide 31 types...
balaclava, balaclava helmet
a cap that is close-fitting and woolen and covers all of the head but the face
Balmoral, bluebonnet
a brimless dark blue Scottish cap with a flat top and a plume on one side
baseball cap, golf cap, jockey cap
a cap with a bill
bathing cap, swimming cap
a tight-fitting cap that keeps hair dry while swimming
a cap with no brim or bill; made of soft cloth
a child's tight-fitting cap; often ties under the chin
berretta, biretta, birretta
a stiff cap with ridges across the crown; worn by Roman Catholic clergy
calpac, calpack, kalpac
a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus
cloth cap, flat cap
a flat woolen cap with a stiff peak
cockscomb, coxcomb
a cap worn by court jesters; adorned with a strip of red
coonskin, coonskin cap
a raccoon cap with the tail hanging down the back
fez, tarboosh
a felt cap (usually red) for a man; shaped like a flat-topped cone with a tassel that hangs from the crown
garrison cap, overseas cap
a wedge-shaped wool or cotton cap; worn as part of a uniform
a Scottish cap with straight sides and a crease along the top from front to back; worn by Highlanders as part of military dress
a cap that is wrapped around by a turban and worn by Muslim religious elders
kepi, peaked cap, service cap, yachting cap
a cap with a flat circular top and a visor
liberty cap
close-fitting conical cap worn as a symbol of liberty during the French Revolution and in the U.S. before 1800
large high frilly cap with a full crown; formerly worn indoors by women
an academic cap with a flat square with a tassel on top
a cloth cap worn in bed
a woman's cap with two long flaps pinned on
sailor cap
a cap worn by sailors
shower cap
a tight cap worn to keep hair dry while showering
ski cap, stocking cap, toboggan cap
a close-fitting woolen cap; often has a tapering tail with a tassel
rounded brimless cap fitting the crown of the head
tam, tam-o'-shanter, tammy
a woolen cap of Scottish origin
watch cap
a knitted dark blue wool cap worn by seamen in cold or stormy weather
wishing cap
a magical cap that secures whatever one wishes for
beanie, beany
a small skullcap; formerly worn by schoolboys and college freshmen
a skullcap worn by nuns under a veil or by soldiers under a hood of mail or formerly by British sergeants-at-law
yarmelke, yarmulka, yarmulke
a skullcap worn by religious Jews (especially at prayer)
Type of:
headdress, headgear
clothing for the head

n something serving as a cover or protection

show 5 types...
hide 5 types...
distributor cap
the cap of the distributor that holds in place the wires from the distributor to the spark plugs
collet, ferrule
a metal cap or band placed on a wooden pole to prevent splitting
cap that fits over the hub of a wheel
lens cap, lens cover
cap used to keep lens free of dust when not in use
a small metal cap to protect the finger while sewing; can be used as a small container
Type of:
protection, protective cover, protective covering
a covering that is intend to protect from damage or injury

n a top (as for a bottle)

a cap that seals a bottle
a flexible cap on a baby's feeding bottle or pacifier
radiator cap
cap on the opening in the top of a radiator through which a coolant liquid can be added
Type of:
cover, top
covering for a hole (especially a hole in the top of a container)

n (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth

crown, crownwork, jacket, jacket crown
Type of:
dental appliance
a device to repair teeth or replace missing teeth

n a protective covering that is part of a plant

Type of:
cover, covering, natural covering
a natural object that covers or envelops

n a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom

Type of:
plant part, plant structure
any part of a plant or fungus

n the upper part of a column that supports the entablature

capital, chapiter
Type of:
the upper part of anything

v lie at the top of

“Snow capped the mountains”
Type of:
be located or situated somewhere; occupy a certain position

n an upper limit on what is allowed

“they established a cap for prices”
ceiling, roof
glass ceiling
a ceiling based on attitudinal or organizational bias in the work force that prevents minorities and women from advancing to leadership positions
Type of:
the economic policy of controlling or limiting or curbing prices or wages etc.

v restrict the number or amount of

“We had to cap the number of people we can accept into our club”
Type of:
circumscribe, confine, limit
restrict or confine, "I limit you to two visits to the pub a day"

n a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive

detonating device, detonator
blasting cap
a small tube filled with detonating substances; used to detonate high explosives
percussion cap
a detonator that explodes when struck
Type of:
explosive device
device that bursts with sudden violence from internal energy

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, can put you on the path to systematic vocabulary improvement.