Meaning of RANDOM in English
/ ˈrændəm; NAmE / adjective , noun
[ usually before noun ] done, chosen, etc. without sb deciding in advance what is going to happen, or without any regular pattern :
the random killing of innocent people
a random sample / selection (= in which each thing has an equal chance of being chosen)
The information is processed in a random order.
► ran·dom·ly adverb :
The winning numbers are randomly selected by computer.
My phone seems to switch itself off randomly.
► ran·dom·ness noun [ U ]:
It introduced an element of randomness into the situation.
- at random
Middle English (in the sense impetuous headlong rush ): from Old French randon great speed, from randir gallop.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005