---
title: inputMetaParameterDefinition
framework: phase
role: symbol
role_heading: Instance Property
path: phase/phasemappedmetaparameterdefinition/inputmetaparameterdefinition
---

# inputMetaParameterDefinition

A linear input value to plot on a curve.

## Declaration

```swift
var inputMetaParameterDefinition: PHASENumberMetaParameterDefinition { get }
```

## Discussion

Discussion This property defines the input value to plot on a graph defined by envelope. To retrieve the output value, an app passes the metaparameter’s value to the evaluate(x:) function.