Cap is a word with several meanings. It can referto point to or mean another thing to a cover, a limitthe highest amount allowed or possible, a type of hat, the top part of something, or an action that puts a limit on something. The most common everyday use is the idea of a limit or maximumthe greatest amount or number possible.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Pronunciation
AI-generated pronunciation audio (OpenAI).
Accent: General American English
IPA: /kæp/
Easy pronunciation: CAP (approximate spelling).
Stress: One syllable, stressed.
Use this noun sense for an upper limit on what is allowed.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Cap Meaning
a maximum amount or level
Part of speech: noun
Definition: an upper limit on what is allowed
Example: The company put a cap on travel expenses.
Synonyms for this meaning:
- ceiling — Works well for a maximum limit or amount.
- roof — Can mean an upper limit, though it is less common and more figurative.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Other Meanings of Cap
Meaning 2
to limit how much or how many
Part of speech: verb
Definition: restrict the number or amount of
Example: The school capped the number of students in each class.
Meaning 3
to cover or sit on top of
Part of speech: verb
Definition: lie at the top of
Example: Snow capped the mountains.
Synonyms for this meaning:
- crest — Works for something topping or covering the top of a mountain or similar shape.
Meaning 4
a covering on part of a plant
Part of speech: noun
Definition: a protective covering that is part of a plant
Example: The fungus formed a cap over the stem.
Synonyms for this meaning:
- hood — A possible substitute in some botanical contexts, though not always exact.
Meaning 5
the top part of a column
Part of speech: noun
Definition: the upper part of a column that supports the entablature
Example: The carved cap of the column was badly worn.
Synonyms for this meaning:
- capital — The standard architectural term for this part of a column.
- chapiter — An older term for a column capital.
Meaning 6
the top part of a mushroom or similar fungus
Part of speech: noun
Definition: a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom
Example: The mushroom cap was wide and pale.
Synonyms for this meaning:
- pileus — The technical term for the cap of a mushroom.
Meaning 7
a small explosive device used to trigger a blast
Part of speech: noun
Definition: a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive
Example: The engineer used a detonator to set off the charge.
Synonyms for this meaning:
- detonating device — Matches the explosive sense.
- detonator — A standard term for a device used to set off explosives.
Meaning 8
a maximum allowed amount
Part of speech: noun
Definition: an upper limit on what is allowed
Example: There is a salary cap in the league.
Synonyms for this meaning:
- ceiling — Common and natural in the sense of a maximum allowed amount.
- roof — Can be used figuratively for a maximum, but is less natural than ceiling.
Meaning 9
an artificial covering for a tooth
Part of speech: noun
Definition: (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
Example: She got a cap on her damaged tooth.
Synonyms for this meaning:
- crown — The normal word for a dental cap.
- crownwork — A more technical dental term.
- jacket — Used in dentistry for a type of tooth cap or crown.
- jacket crown — A technical dental term for this kind of restoration.
Meaning 10
a close-fitting hat
Part of speech: noun
Definition: a tight-fitting headdress
Example: He wore a wool cap in the cold weather.
Meaning 11
a lid or top that fits on something
Part of speech: noun
Definition: a top (as for a bottle)
Example: Twist the cap off the bottle.
Meaning 12
something that covers or protects something else
Part of speech: noun
Definition: something serving as a cover or protection
Example: The pipe had a protective cap on it.
Reviewed with OpenAI Decisions. Assessment: inaccurate — correction needed. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Cap Synonyms
Similar Meaning
- ceiling
verb: lie at the top of
- crest
noun: a protective covering that is part of a plant
- hood
noun: the upper part of a column that supports the entablature
- capital
- chapiter
noun: a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom
- pileus
noun: 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
noun: an upper limit on what is allowed
- ceiling
- roof
noun: (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
- crown
- crownwork
- jacket
- jacket crown
Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Common Mistakes
- Not every use of cap means a hat; it can also mean a limit, a covering, or a technical part of something.
- Cap as a verb usually means to limit or to top something, not to remove a cap.
- A dental cap is usually called a crown in modern English.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Frequently Asked Questions
What is the most common meaning of cap?
The most common everyday meaning is a limit or maximum, as in a cap on prices or spending.
Is cap a noun or a verb?
It can be both. As a noun, it can mean a hat, cover, limit, or several technical things. As a verb, it often means to limit or to cover the top of something.
What is a synonym for cap meaning limit?
Ceiling is the strongest synonym for that sense.
Does cap always mean a hat?
No. That is one common meaning, but cap also has other meanings such as a limit, a cover, or a top part of something.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.