It refers to the 40th day of Lent in the Christian calendar, also known as Quadragesima.

क्वाड्रागेसिमा (Lent का 40वां दिन)

English Usage: Many Christians observe fasting during Quadragesima as a time of reflection.

Hindi Usage: कई ईसाई क्वाड्रागेसिमा के दौरान प्रतिबिंब के समय के रूप में उपवास का पालन करते हैं।