the process of responding to a stimulus

प्रतिक्रिया की प्रक्रिया

English Usage: His reaction to the news was surprising.

Hindi Usage: उसकी खबर पर प्रतिक्रिया आश्चर्यजनक थी।

the speed of something in a given direction

किसी चीज़ की गति एक निर्दिष्ट दिशा में

English Usage: The velocity of the car increased as it went downhill.

Hindi Usage: जैसे ही कार नीचे की ओर गई, उसकी गति बढ़ गई।