A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

Something that precipitates an event or change.

कुछ ऐसा जो एक घटना या परिवर्तन को उत्प्रेरित करता है।

English Usage: The new policy was a catalyst for change within the organization.

Hindi Usage: नई नीति संगठन के भीतर परिवर्तन के लिए एक उत्प्रेरक थी।

The process of rotting or decomposing.

The gradual decline in quality, power, or vigor.

गुणवत्ता, शक्ति, या जीवन शक्ति में धीरे-धीरे कमी।

English Usage: The decay of the old building was evident as bricks crumbled and fell.

Hindi Usage: पुरानी इमारत का सड़ना स्पष्ट था क्योंकि ईंटें टूट कर गिर गईं।