IPA: /ˈrændəmli/
KK: /ˈrændəmli/
In a way that is not planned or organized, often by chance.
The numbers were selected randomly for the lottery.
Randomly → It is formed from "random" (from Middle English *randoun*, meaning chance or by chance) and the suffix "-ly" (meaning in a manner of). The word "randomly" means in a manner that is determined by chance.
Think of doing something 'by chance' ('random') and the '-ly' just means in that manner. This helps you remember that 'randomly' refers to actions taken without a specific plan.