cap

1 of 6

noun (1)

ˈkap 

often attributive

1

a

: a head covering especially with a visor and no brim

b

: a distinctive head covering emblematic of a position or office: such as

(1)

: a cardinal's biretta

(2)

: mortarboard

2

: a natural cover or top: such as

a

: an overlying rock layer that is usually hard to penetrate

b(1)

: pileus

(2)

: calyptra

c

: the top of a bird's head or a patch of distinctively colored feathers in this area

3

a

: something that serves as a cover or protection especially for a tip, knob, or end

a bottle cap

b

: a fitting for closing the end of a tube

c

British : cervical cap

d

: an artificial crown for a tooth

4

: an overlaying or covering structure

5

: a paper or metal container holding an explosive charge (as for a toy pistol)

6

: an upper limit (as on expenditures) : ceiling

a cap on military spending

7

: the symbol ∩ indicating the intersection of two sets compare cup sense 9

8

: a cluster of molecules or chemical groups bound to one end or a region of a cell, virus, or molecule

cap

2 of 6

verb

capped; capping

transitive verb

1

a

: to provide or protect with a cap

cap a bottle

b

: to give a cap to as a symbol of honor, rank, or achievement

2

: to form a cap over : crown

mountains capped with mist

3

a

: to follow with something more noticeable or more significant : outdo

b

: to bring to a climax or conclusion

cap off the show with a song

4

: to form a chemical cap on

5

: to prevent from growing or spreading : set an upper limit on

cap oil prices

6

: to supply (a tooth) with an artificial crown

intransitive verb

: to form or produce a chemical cap

cap

3 of 6

noun (2)

: a small amount of an illegal or legally regulated drug

especially : a small amount of a drug enclosed in a capsule

a cap of cocaine

cap

4 of 6

noun (3)

plural caps

1

: capitalization sense 1d

2

: a capital letter

—usually plural

a message written in caps

According to [linguist Deborah] Tannen, women's preference for expressive hashtags is "similar to their using exclamation points, caps, and repetition of letters to show emphasis, and to the fact that women's spoken intonation patterns tend to vary more than men's."

—Jessica Bennett

Good netiquette includes not using all caps [=exclusively capital letters] when typing, as it comes across as shouting.

—John DeGarmo

cap

5 of 6

abbreviation (1)

1

capacity

2

capital

3

capitalize; capitalized

CAP

6 of 6

abbreviation (2)

1

Civil Air Patrol

2

combat air patrol

Phrases

cap in hand

: in a respectful, humble, or sometimes fearful manner

went cap in hand to the governor to seek more funds for education

Synonyms

Noun (1)

• chapeau
• hat
• headdress
• headgear
• headpiece
• lid [slang]

Verb

• circumscribe
• confine
• hold down
• limit
• restrict

Noun (2)

• capsule
• lozenge
• pill
• tablet

Examples of cap in a Sentence

Verb

a pipe capped at one end

Be sure to cap the pen when you are done using it.

The report caps a ten-year study of lung cancer among nonsmokers.

a concert capped by a fantastic fireworks display

If the teams don't cap player salaries, the league won't survive.

The law would cap legal immigration.

The government wants to cap councils that spend too much.

Recent Examples on the Web

Noun

Storms this winter have caused significant damage, knocking down one of the pier’s pilings, a portion of the pile cap and large sections of its railing. —Emily Alvarenga, San Diego Union-Tribune, 7 Apr. 2024

While local governments, including Montgomery and Prince George’s counties, have passed legislation limiting rent increases in recent years, there is no such statewide cap. —Emily Guskin, Washington Post, 6 Apr. 2024

Dozens of measures have become law, ranging from a de facto ban on combustion engines in new cars by 2035 to tougher pollution caps on companies and a new carbon market for fuels. —Ewa Krukowska, Fortune Europe, 5 Apr. 2024

The bill raises the cap on fines from $500 to $1,000, and allows that penalty for each resident affected by a violation, and for every day the violation persists. —Sahana Jayaraman, The Arizona Republic, 4 Apr. 2024

Drop to your knees, rolling to the top of your knees to protect your knee caps. —Christa Sgobba, SELF, 2 Apr. 2024

If state lawmakers had raised caps on school funding to keep up with inflation over the last 15 years, MPS officials estimate the district would be getting an extra $210 million each year, about $3,380 per student. —Rory Linnane, Journal Sentinel, 2 Apr. 2024

With the drug companies, several of which are now suing to fight that cap. —Taylor Wilson, USA TODAY, 1 Apr. 2024

Proponents said the cap would make the distribution more equitable by giving more money to rural, struggling districts. —Becca Savransky, Idaho Statesman, 26 Mar. 2024

Verb

Lefty specialist Stone Hewlett came on to strike out Andrew Fischer to cap the win and record his second save. —Tom Murphy, arkansasonline.com, 5 Apr. 2024

Melendez followed with a 421-foot homer to right center to cap the outburst. —Pete Grathoff, Kansas City Star, 5 Apr. 2024

Those who bought an eligible product and have a receipt are entitled to get 2% of the total cost of their purchase, capped at $500, according to the settlement site. —Kate Gibson, CBS News, 4 Apr. 2024

The tours are set to run from July 1 to August 4, capped at 10 people per session. —Janine Henni, Peoplemag, 3 Apr. 2024

The report caps years of growing frustration with Microsoftamong lawmakers, government officials and industry experts. —Joseph Menn, Washington Post, 2 Apr. 2024

Their joint filing seeks to cap the companies' liability at roughly $43.6 million. —Michael Kunzelman and Rebecca Boone, Quartz, 1 Apr. 2024

Their joint filing seeks to cap the companies’ liability at roughly $43.6 million. —Michael Kunzelman, Fortune, 1 Apr. 2024

Recent laws to tax share buybacks and reduce tax benefits for expatriates — alongside a bill that would cap the number of foreign students allowed to study in the country — have set off alarms at firms that rely on international talent. —Bysarah Jacob, Fortune Europe, 27 Mar. 2024

Word History

Etymology

Noun (1) and Verb

Middle English cappe, from Old English cæppe, from Late Latin cappa head covering, cloak

Noun (2)

short for capsule

First Known Use

Noun (1)

before the 12th century, in the meaning defined at sense 1a

Verb

15th century, in the meaning defined at transitive sense 1a

Noun (2)

1942, in the meaning defined above

Noun (3)

1906, in the meaning defined at sense 1

Phrases Containing cap

• a feather in one's cap
• a feather in someone's cap
• baseball cap
• bathing cap
• blasting cap
• cap-and-trade
• cap-a-pie
• cap in hand
• cap sleeve
• cervical cap
• cradle cap
• death cap
• doff one's cap to
• dunce cap
• fool's cap
• garrison cap
• gimme cap
• ice cap
• if the cap fits
• if the cap fits, wear it
• inky cap
• liberty cap
• mushroom cap
• overseas cap
• percussion cap
• put one's thinking cap on
• put on one's thinking cap
• root cap
• screw cap/top
• service cap
• shower/bathing cap
• shower cap
• stocking cap
• swimming cap
• thinking cap
• tip one's cap/hat
• to cap it off
• toe cap
• trucker cap
• watch cap

Kids Definition

cap

1 of 2 noun

ˈkap 

1

: a head covering

especially : one that has a visor and no brim

2

: something that serves as a cover or protection for something

a bottle cap

3

: a natural cover or top: as

a

: the umbrella-shaped part that bears the spores of a mushroom

b

: the top of a bird's head

4

: a paper or metal container holding a small explosive charge (as for a toy pistol)

cap

2 of 2 verb

capped; capping

1

: to cover or provide with a cap

2

: to follow with something : outdo

3

: to bring to a conclusion

capped off the show with a song

4

: to prevent from growing or spreading : set a limit on

capped oil prices

Etymology

Noun

Middle English cappe "cap," from Old English cæppe "cap," from Latin cappa "head covering, cloak" — related to cape entry 2, chapel

Medical Definition

cap

1 of 3 noun

ˈkap 

often attributive

1

: a natural cover or top: as

a

: pileus

b

: patella, kneecap

2

: something that serves as a cover or protection especially for a tip, knob, or end (as of a tooth)

3

British : cervical cap

4

: a cluster of molecules or chemical groups bound to one end or a region of a cell, virus, or molecule

the cell surface receptors were redistributed into caps

cap

2 of 3 verb

capped; capping

transitive verb

1

: to invest (a student nurse) with a cap as an indication of completion of a probationary period of study

2

: to cover (a diseased or exposed part of a tooth) with a protective substance

3

: to form a chemical cap on

the capped end of a messenger RNA

intransitive verb

: to form or produce a chemical cap

cap

3 of 3 abbreviation

1

capacity

2

capsule

Legal Definition

cap

noun

ˈkap 

: an upper limit

a jury found that KAL had committed “willful misconduct,” thus removing the Warsaw Convention's $75,000 cap on damages

—Dooley v. Korean Air Lines, 524 U.S. 116 (1998)

cap verb