IPA: /ˈpiːsəblɪ/
KK: /ˈpisəblē/
In a way that promotes or maintains peace; without conflict or disturbance.
The two countries agreed to resolve their differences peaceably.
Peaceably → It is formed from "peace" (from Old French *pais*, meaning tranquility or absence of conflict) and "-ably" (meaning in a manner). The word "peaceably" means in a manner that promotes or maintains peace.
Think of the word 'peace' which means tranquility, and remember that 'peaceably' describes doing something in a peaceful manner.