# caliper

/ˈkæɫəpɝ/ (US) · /kˈælɪpɐ/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/caliper
Updated: 2026-10-15

## Definition

a small measuring tool with two arms that you close around something to check how thick, wide, or round it is.

For teachers: a measuring instrument with two adjustable jaws or legs for determining thickness, diameter, or distance between surfaces. Often fitted with a sliding scale or digital display for precise readings.

## Examples

- He uses a caliper to measure the bolt.
- The mechanic uses a caliper to check the thickness of the brake disc before ordering parts.
- The engineer tightened the caliper around the cylinder and noted a deviation of less than a tenth of a millimetre from the specification.

## Usage notes

- Often appears in the plural form 'calipers' when referring to the measuring instrument.

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