A worthless or misguided justification for a project or task, often handed down by Pointy-Haired-Bosses. Example: The project was so flawed I couldn't believe anyone could have thought it would work, until I found out the irrationale had come from the Marketing Department. Just what you should expect from Marketing, eh?
IRRATIONALE
Meaning of IRRATIONALE in English
Slang English vocab. Английский сленговый словарь. 2012