Pedestrian and crowd dynamics involves multiple disciplines, including com puter science, engineering, mathematics, physics, bio-mechanics, psychology, social sci ence and more. For effective collaboration between disciplines, researchers need a com mon understanding of key concepts. To address this challenge, A Glossary for Human and Crowd Dynamics was published six years ago, providing researchers with a valuable reference for cross-disciplinary communication. We now present the second version, which includes 53 new concepts and 12 revisions from the first glossary, collaboratively developed by 65 contributors from various disci plines and regions around the world through a multi-stage process. This process involved identifying new concepts not covered in the first glossary and suggesting revisions to ex isting entries, voting on proposed additions and modifications, writing definitions for the selected concepts, and collaboratively revising and editing the entries. By introducing new terms and refining existing definitions, this glossary aims to facil itate clearer communication, improve conceptual consistency, and support collaboration among researchers working within the field of human and crowd dynamics from diverse perspectives.