Learner's definition of RANDOM
[more random; most random]
chosen, done, etc., without a particular plan or pattern
a random sequence of letters
A random sample/sampling/selection of doctors from around the country were selected for the study.
We tasted the wines in random order and then rated each.
a random collection of buttons
random drug testing
She collects random photographs that she finds in antique shops.
Pick a random word on the page.
The computer program generates a list of random numbers.
in a way that does not follow a particular plan or pattern