IPA: /ɪnˈfɔːrmətɔːri/
KK: /ɪnˈfɔːrməˌtɔːri/
Providing useful or interesting information.
The teacher gave an informatory lecture that helped us understand the topic better.
Informatory → It is formed from "inform" (from Latin "informare", meaning to shape or form) and "-ory" (meaning relating to or characterized by). The word "informatory" refers to something that is related to providing information or shaping knowledge.
Think of 'inform' as shaping knowledge, and '-ory' means relating to. So, something that is 'informatory' helps shape or provide information.