From Longman Dictionary of Contemporary Englishat randomat randomCHANCE/BY CHANCEwithout any definite plan, aim, or patternchoose/select/pick something at random The gang picked their victims at random. → random
Examples from the Corpus
at random• While he waited, he picked up a magazine, turned to a page at random, and started reading.• We selected the agencies at random from the phone book.• The forms were distributed at random to people passing by.• Twenty students were chosen at random to take part in the experiment. 