# ATTREDEF Command
[GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md)
**Function Description:**
This command is used to redefine a block and update associated attributes.
**Command Access:**
> **Icon: /**
> **Menu: /**
> **Ribbon: /**
> **Toolbar: /**
> **Command:** ATTREDEF
> **Alias: /**
**Command Prompts:**
```
Enter name of the block you wish to redefine:
```
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**Related References：**
- [Commands about Block Attributes (GstarCAD 2026)](../../2026/Commands/Commands%20about%20Block%20Attributes.md)
**Related Concepts：**
- [About Modifying Block Definitions (GstarCAD 2026)](../../2026/Commands/About%20Modifying%20Block%20Definitions.md)
**Related Tasks：**
- [To Edit Attribute Definitions (GstarCAD 2026)](../../2026/Commands/To%20Edit%20Attribute%20Definitions.md)
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[Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences/ATTREDEF.html) · © Gstarsoft Co., Ltd.