---
title: definition
framework: coreimage
role: symbol
role_heading: Instance Property
path: coreimage/cisampler/definition
---

# definition

The domain of definition (DOD) of the sampler

## Declaration

```swift
var definition: CIFilterShape { get }
```

## Discussion

Discussion The DOD contains all nontransparent pixels produced by referencing the sampler.

## See Also

### Getting Information About the Sampler Object

- [extent](coreimage/cisampler/extent.md)