random

Từ điển American Heritage Dictionary 4th

ran·dom (rănʹdəm)adj.
1. Having no specific pattern, purpose, or objective:
random movements.
See Synonyms at chance.
2. Mathematics & Statistics. Of or relating to a type of circumstance or event that is described by a probability distribution.
3. Of or relating to an event in which all outcomes are equally likely, as in the testing of a blood sample for the presence of a substance.Idiom:at random
Without a governing design, method, or purpose; unsystematically:
chose a card at random from the deck. [From at random, by chance, at great speed, from Middle English randon, speed, violence, from Old French, from randir, to run, of Germanic origin.] ranʹdom·ly adv.ranʹdom·ness n.