The school is conducting an investigation into the cheating incident during exams.

investigation 是动词 investigate 的名词形式，由前缀 in-（表示"进入"）和词根 vestig（追踪）加上名词后缀 -ation 构成，字面意思是"追踪进入"，引申为"调查、侦查"的意思。