Pydev (also related to Aptana distro ) does not seem to have any error similar to the one you are describing.
Here is a list of errors, including the word "definition" for PyDev: errors,
you can open an error report there with the exact version of eclipse, pydev, java used
:
Pydev ? (.. + Pydev)?
:
Feature List Pydev "Open Source" Pydev Extensions
---------------------------------------------------------------
Go to definition BRM* Pydev Extensions(2)
BRM *: Bicycle Repair Man - , "go-to-definition" . "go-to-definition" Python "" ( "" ). " ".
Pydev (2): Pydev " ", python jython, "".