component

American  

[kuhm-poh-nuhnt, kom-] / kəmˈpoʊ nənt, kɒm- /

noun

1. a constituent part; element; ingredient.

2. a part of a mechanical or electrical system.

   They checked the pads, rotors, and other components of my car's brake system.

3. Physics. the projection of a vector quantity, as force or velocity, along an axis.

4. Physical Chemistry. one of the set of the minimum number of chemical constituents by which every phase of a given system can be described.

5. Mathematics.

   1. a connected subset of a set, not contained in any other connected subset of the set.

   2. a coordinate of a vector.

6. Linguistics.

   1. one of the major subdivisions of a generative grammar.

      base component;

      transformational component;

      semantic component;

      phonological component.

   2. a feature determined by componential analysis.

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adjective

1. being or serving as an element (in something larger); composing; constituent.

   the component parts of a computer system.

component British  

/ kəmˈpəʊnənt, ˌkɒmpəˈnɛnʃəl /

noun

1. a constituent part or aspect of something more complex

   a component of a car

2. Also called: element.  any electrical device, such as a resistor, that has distinct electrical characteristics and that may be connected to other electrical devices to form a circuit

3. maths

   1. one of a set of two or more vectors whose resultant is a given vector

   2. the projection of this given vector onto a specified line

4. one of the minimum number of chemically distinct constituents necessary to describe fully the composition of each phase in a system See phase rule

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adjective

1. forming or functioning as a part or aspect; constituent

Related Words

See element.

Other Word Forms

• componental adjective
• componented adjective
• componential adjective
• subcomponent noun

Etymology

Origin of component

First recorded in 1555–65; from Latin compōnent- (stem of compōnēns, present participle of compōnere “to put together”), equivalent to com- com- + pōn(ere) “to put” + -ent- -ent

Explanation

It's the Ikea curse: You spend four hours figuring out how to piece together your new furniture, only to be left with one random component, or part, that doesn't seem to fit anywhere. It's not surprising that component is related to a Latin word that means "to put together." You simply can't put something together without all of the correct components. Technically speaking, a component is an element of a system or a part of a machine. But a component can also be a factor or ingredient, such as the components of a decision or the components of a really good chocolate cake.

Example Sentences

Even silver has more uses than gold, as a component in solar panels, medical devices and electric vehicles, for example.

From Barron's • Apr. 10, 2026

This is largely because the crucial component of any negotiation—the time factor—now works for Tehran.

From The Wall Street Journal • Apr. 10, 2026

At the center of the new design is an improved version of a widely used component known as a DC-DC step-down converter.

From Science Daily • Apr. 10, 2026

Demographic groups across ages, incomes and political parties all posted setbacks in sentiment, as did every component of the index, reflecting the widespread nature of this month’s drop, researchers at the university said.

From MarketWatch • Apr. 10, 2026

The ship is made of millions of separate parts assembled redundantly, so that if some component fails, others will take over its responsibilities.

From "Cosmos" by Carl Sagan

Related Words

• factor
• ingredient
• item
• peripheral
• piece
• segment
• unit