Meaning of RANDOM in English

[adjective] - happening, done, or chosen by chance rather than according to a planWe asked a random sample/selection of people what they thought.This is the latest in a sequence of seemingly random crimes/attacks/killings.The choice of poems included in the collection seems somewhat random.(ANZ) A random breath test ( RBT) is a test given by the police to drivers chosen by chance, to measure the amount of alcohol the drivers have in their blood.

Cambridge English vocab.      Кембриджский английский словарь.