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To define a key value in Gradle that can be utilized by web.xml and properties files across all modules, you can include the value in a Gradle file called "gradle.properties".

Here are the steps:

1. Create a file called "gradle.properties" in the root directory of your project.
2. Inside this file, define your key value pair. For example:

myKey=myValue

1. In your Gradle build script, you can reference this key value pair by using the "project" object. For example, if you want to use the value in the web.xml file, you can do something like this:

<context-param>
  <param-name>myKey</param-name>
  <param-value>${project.myKey}</param-value>
</context-param>

1. Similarly, in properties files, you can reference the key value by using the "${project.myKey}" syntax.

By defining the key value in the "gradle.properties" file, you can make it available across all modules in your project.