IPA: /ɪˈluːmɪnətɪv/
KK: /ɪˈluːmɪnətɪv/
Relating to or capable of providing light or making something clearer and easier to understand.
The teacher's explanation was very illuminative, helping the students grasp the complex topic.
Illuminative is formed from "illuminare" (meaning to light up or make bright) and the suffix "-ive" (meaning having the nature of). The word describes something that has the nature of bringing light or clarity.
Think of 'lighting up' ('illuminare') to remember that 'illuminative' means having the nature of bringing light or clarity.