cap (Noun) — A close-fitting hat, either without a brim or with a peak.
cap (Noun) — A top (as for a bottle).
cap (Noun) — A mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive.
cap (Noun) — Something serving as a cover or protection.
cap (Noun) — A fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom.
cap (Noun) — A protective covering that is part of a plant.
cap (Noun) — An upper limit on what is allowed. ex. "they established a cap for prices"
cap (Noun) — (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth. ex. "tomorrow my dentist will fit me for a cap"
cap (Noun) — The upper part of a column that supports the entablature.
cap (Verb) — Lie at the top of. ex. "Snow capped the mountains"
cap (Verb) — Restrict the number or amount of. ex. "We had to cap the number of people we can accept into our club"
cap (Verb) — Finish or complete, as with some decisive action. ex. "he capped off the meeting with a radical proposal"
cap (Verb) — Top or seal with a cover; put a cap on.
cap (Verb) — Surpass or outdo.