Need a sentence definition? Here are some sources for sentence definitions on the Internet.

• Dictionary Search
  Ask Jeeves
  
  
• Dictionary.com
  
  
  
• OneLook Dictionary Search
  
  
  
• Merriam-Webster OnLine
  
  
  
• Oxford English Dictionary
  

Here are some Websites that discuss the writing of sentence definitions:

• Definitions
  The University of Texas at Austin Mechanical Engineering Department
  
  
• Information Developer's Toolkit: Preparing Definitions
  The Studio of Saul Carliner: Content Development for the Workplace
  
  
• Drafting Definitions > Parenthetical and Sentence Definitions
  EnglishOnline.net
  
  
• Types of Definitions
  Spokane Community College
  
  
• Information Structures-Definition
  Université Laval