Peripheral: Definition, Meaning, and Examples

Last Updated on
September 14, 2026

1. Peripheral (adjective): Relating to or situated on the outer edges or boundaries of something.
2. Peripheral (adjective): Of secondary or minor importance; not central to the main issue.
3. Peripheral (noun): A device connected to a computer to add functionality, such as a mouse, keyboard, or printer.

"Peripheral" describes something located on the outer edge or boundary of an area, object, or field of vision. It can refer to things that are supplementary or not centrally important to a main subject or activity. The word also applies to devices or equipment that connect to a computer but are not part of its core system. Discover how peripheral functions in various contexts by examining its meanings, origins, and applications across different fields.

"Peripheral" Definition: What Does "Peripheral" Mean?

The term "peripheral" can be used in a variety of ways to describe position, importance, or technology. Its flexibility makes it a valuable word in fields like anatomy, computing, and general conversation.

Definition of "Peripheral": Outer Position

In a physical or spatial context, "peripheral" means located at or near the outer edges of an object or area. This is common in anatomy or vision.

Definition of "Peripheral": Secondary Importance

In discussion or argument, "peripheral" can describe something that’s not central to the topic at hand. It indicates lesser relevance or priority.

Definition of "Peripheral": Computer Device

As a noun in technology, "peripheral" refers to external hardware connected to a computer to expand its functionality, such as input, output, or storage devices.

Parts of Speech

"Peripheral" can be used both as an adjective and a noun. As an adjective, it describes something on the edge or less important. As a noun, it refers specifically to hardware devices in computer science. Its use as an adjective is more versatile and frequent, while its noun form is limited mainly to technological contexts.

How to Pronounce "Peripheral"?

Pronunciation of "peripheral" can be tricky due to its multiple syllables and soft ending.

Begin with "puh" (rhyming with "duh"), then "RIF" (emphasize this syllable), followed by "uh," and end with "ruhl." Be careful not to stress the final syllables. Practice slowly to pronounce all four syllables clearly.

Phonetic Pronunciation: /pəˈrɪf.ɚ.əl/

Synonyms of "Peripheral": Other Ways to Say "Peripheral"

Using synonyms of "peripheral" helps clarify whether you're talking about location, relevance, or devices. Here are some possible alternatives depending on the context:

  • Marginal
  • Secondary
  • Nonessential
  • External
  • Outlying
  • Subordinate
  • Auxiliary

Antonyms of "Peripheral": Other Ways to Say "Peripheral"

Understanding the opposites of "peripheral" helps describe core, important, or central matters. Here are some antonyms:

Examples of "Peripheral" in a Sentence

Examples show how "peripheral" is used across disciplines and settings. Here are ten sentences that use "peripheral":

  1. He had only peripheral vision after the accident.
  2. The discussion focused on the main topic, ignoring peripheral issues.
  3. The keyboard and mouse are common computer peripherals.
  4. They built houses on the peripheral lands around the city.
  5. She noticed something moving in her peripheral field of vision.
  6. That concern is peripheral to the goals of this project.
  7. A printer is a typical example of a peripheral device.
  8. The soldiers guarded the peripheral entrances of the camp.
  9. His involvement was peripheral at best.
  10. The new regulations affect even peripheral suppliers.

Frequency of Use

"Peripheral" is moderately used in both spoken and written English. It appears more frequently in technical and academic contexts, especially in computer science, medicine, and discussions of relevance or importance. According to Google’s Ngram Viewer, the word began gaining more widespread use in the 20th century as technology advanced, and its use continues to grow in modern professional language.

Variants of "Peripheral"

Though "peripheral" is typically used in its base form, there are a few variants and related grammatical forms. Here are the most notable:

  1. Peripherally: Adverb form meaning "in a peripheral manner" or "on the edge."
  2. Periphery: Noun form referring to the outer boundary or limit of an area or group.
  3. Peripheralize: Rare verb form meaning to treat as peripheral or move to the margins.

Related Terms to "Peripheral"

Learning related terms can deepen your understanding and improve precision when speaking or writing. Here are some related terms:

  1. Periphery
  2. Peripheral vision
  3. Peripheral device
  4. Edge
  5. Fringe
  6. External hardware

Etymology: History and Origins of "Peripheral"

The word "peripheral" comes from the Greek word *peripherēs*, meaning "circumference" or "outer surface," based on the root *peri-* meaning "around." It entered English in the 19th century, originally to describe outer areas or surfaces. As time passed, its use expanded into anatomy (e.g., peripheral nerves) and then into computing, where it referred to devices external to the computer’s main processing unit. Its metaphorical use for unimportance or secondary matters has become common in modern discussions.

Derivatives and Compounds of "Peripheral"

Several forms and combinations of "peripheral" are used in technology, medicine, and general language. Here are some notable examples:

  1. Peripheral vision: The part of vision outside the direct line of sight.
  2. Peripheral nervous system: The part of the nervous system outside the brain and spinal cord.
  3. Peripheral device: Any external device attached to a computer.
  4. Peripheral artery disease: A medical condition affecting circulation to outer limbs.

Common Misspellings of "Peripheral"

Due to its length and complex structure, "peripheral" is often misspelled. Here are some common errors:

  1. Peripherial
  2. Periferal
  3. Periferral
  4. Perifarel

10 Idioms Similar to "Peripheral"

Though "peripheral" is not an idiom itself, certain idiomatic expressions convey similar ideas of being on the edge or secondary. Here are ten idioms that relate to the meaning of "peripheral":

  1. On the sidelines
  2. Off the beaten path
  3. On the fringe
  4. Out of the loop
  5. On the edge
  6. Take a backseat
  7. Out in left field
  8. Low on the totem pole
  9. Not front and center
  10. Back burner issue

10 Common Questions About "Peripheral"

These frequently asked questions help clarify how "peripheral" is used and understood in different contexts.

1. What does "peripheral" mean in general?

It means something that is on the edge or not central, either physically or in terms of importance.

2. Is "peripheral" used in technology?

Yes, in computing, a peripheral is any device that connects to a computer externally, like a mouse or printer.

3. What is peripheral vision?

Peripheral vision is the part of your field of view that occurs outside the very center of gaze.

4. Can people be described as "peripheral"?

Yes, someone can be called peripheral if they are not central to a situation, decision, or group.

5. What’s the noun form of "peripheral"?

As a noun, "peripheral" refers to a computer device connected externally to add functionality.

6. Is "peripheral" a positive or negative word?

It’s neutral by itself, but in context, it can imply being unimportant or less involved.

7. What are examples of computer peripherals?

Examples include keyboards, mice, monitors, printers, external drives, and webcams.

8. What does "peripherally involved" mean?

It means someone was involved in a minor or indirect way, not at the center of the action.

9. How do you use "peripheral" in an essay?

You might say, “The issue was peripheral to the main discussion,” to indicate that it was of lesser importance.

10. What is the opposite of "peripheral" in anatomy?

The opposite would be "central," referring to parts located closer to the core or center, like the brain and spinal cord.

Conclusion

"Peripheral" refers to something on the edge or of lesser importance and can also describe external computer devices. Its wide usage across fields like medicine, technology, and casual speech makes it a versatile word. Use "peripheral" to describe what lies outside the main focus, and explore more terms to strengthen your vocabulary.

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