An automatic response to a stimulus, often learned through experience.

अवश्यम्भावी प्रतिक्रिया

English Usage: The dog exhibited a conditioned reflex when it heard the bell ring.

Hindi Usage: कुत्ते ने घंटी बजते ही एक अवश्यम्भावी प्रतिक्रिया दिखाई।