You can copy separate words from the Babylon result window to Windows Clipboard. To copy a word, click on it using the same combination you use for searching in Babylon. When you click on the word, it is automatically copied (no need to mark it or use ctrl+c). After that you can paste these words to any other Windows application.
You can also save complete definitions using Babylon "Save-it!" mode.
Marking a word in Babylon result window with the left mouse button, will not allow you to copy it, but will search for the new word in Babylon.