广大 (guǎngdà) is an adjective meaning "vast," "broad," or "extensive," used to describe something large in scope or scale. It is frequently used before group nouns to mean "the broad masses of" or "all the many," as in 广大人民 (the broad masses of the people). The term combines 广 (wide) and 大 (big).
广大市民积极参加了这次活动。
guǎngdà shìmín jījí cānjiā le zhè cì huódòng.
The general public actively participated in this event.
这项政策受到了广大群众的欢迎。
zhè xiàng zhèngcè shòudào le guǎngdà qúnzhòng de huānyíng.
This policy was welcomed by the broad masses.
广大学生对新的课程安排很满意。
guǎngdà xuéshēng duì xīn de kèchéng ānpái hěn mǎnyì.
The students at large are very satisfied with the new course schedule.