IPA: /ɪnˈstɪlmənt/
KK: /ɪnˈstɪlmənt/
The action of gradually teaching or introducing an idea, feeling, or quality to someone.
The teacher's goal was the instillment of good values in her students.
Instillment is formed from "in-" (meaning into) and "stillare" (meaning to drip or drop). The word refers to the act of gradually introducing or instilling something into a person or situation, much like a drop of liquid being introduced into a larger body.
Think of something being 'dripped into' ('in-') a larger context — that's why instillment means to gradually introduce or infuse something.