an answer or reply to something

a reaction to a stimulus

प्रतिक्रिया

English Usage: The patient's response to the treatment was encouraging.

Hindi Usage: रोगी की इलाज के प्रति प्रतिक्रिया आशाजनक थी।

to reply to or behave in reaction to something

to make a reply or reaction

प्रतिक्रिया देना

English Usage: He responded quickly to the emergency call.

Hindi Usage: उसने आपातकालीन कॉल का तेजी से उत्तर दिया।