An amount of something that is more than necessary, permitted, or desirable.

An action or feeling that is extreme or excessive.

अत्यधिक क्रिया या भावना

English Usage: His excess of enthusiasm became overwhelming.

Hindi Usage: उसकी अत्यधिक उत्सुकता भारी पड़ गई।

To respond to something.

To undergo a change in response to a stimulus.

उत्तेजक के जवाब में परिवर्तन होना

English Usage: The chemicals will react when mixed together.

Hindi Usage: जब रसायन एक साथ मिलाए जाएंगे तो वे प्रतिक्रिया करेंगे।