遍及 is a verb meaning 'to spread throughout' or 'to pervade'—indicating that something extends widely and uniformly across an area, group, or domain. The character 遍 (biàn) means 'all over', 'every part of', or 'throughout', while 及 (jí) means 'to reach' or 'to extend to'. Together, they form a compact, formal verb emphasizing comprehensive coverage—not just presence in one place, but in many or all places simultaneously.

This word is commonly used in written Chinese and formal speech, especially when describing the widespread occurrence of phenomena such as diseases, trends, technologies, or natural events. It often appears with geographical nouns (e.g., 全国、全球、城乡), abstract domains (e.g., 教育、文化), or collective nouns (e.g., 各行各业). Unlike colloquial alternatives like 到处都是, 遍及 conveys neutrality and objectivity, making it frequent in news reports, academic writing, and official statements.