Relating to or denoting the period in geology that spans from 2.58 million years ago to the present.

Fourth in order or rank.

क्रम या रैंक में चौथा

English Usage: The quaternary structure of proteins is crucial for their function.

Hindi Usage: प्रोटीनों की चौथी संरचना उनके कार्य के लिए महत्वपूर्ण होती है।