IPA: /nɒnˈrændəm/
KK: /nɑnˈrændəm/
Describing something that is not determined by chance, but rather is planned or organized in a specific way.
The study used a nonrandom sample to ensure that the results were representative of the population.
Nonrandom → It is formed from "non-" (meaning not) and "random" (from Latin *randomus*, meaning occurring by chance). The word "nonrandom" means not occurring by chance or not random.
Think of 'not' ('non-') and 'occurring by chance' ('random') to remember that 'nonrandom' means something that is not left to chance.