If "condense" means to make something smaller or more compact:
* Expand: This is the most general antonym.
* Dilate: This refers specifically to making something wider or larger in diameter.
* Extend: This means to make something longer or more extensive.
* Enlarge: This means to increase the size of something.
If "condense" means to make something more concentrated or dense:
* Dilute: This means to make something less concentrated by adding a liquid.
* Thin: This can mean to make something less dense or less concentrated.
* Spread: This means to distribute something over a wider area, making it less dense.
If "condense" means to shorten a text or speech:
* Expand: This means to make something longer by adding more details.
* Elaborate: This means to add more details to something.
* Amplify: This means to make something larger or more intense.
It's important to consider the specific context to determine the most appropriate antonym for "condense."