Nonrandom

[ran-duh m] /ˈræn dəm/

adjective
1.
proceeding, made, or occurring without definite aim, reason, or pattern:
the random selection of numbers.
2.
Statistics. of or characterizing a process of selection in which each item of a set has an equal probability of being chosen.
3.
Building Trades.

4.
Slang.

noun
5.
Slang.

6.
Chiefly British. 3 (def 7b).
adverb
7.
Building Trades. without uniformity:
random-sized slates.
Idioms
8.
at random, without definite aim, purpose, method, or adherence to a prior arrangement; in a haphazard way:
Contestants were chosen at random from the studio audience.
/ˈrændəm/
adjective
1.
lacking any definite plan or prearranged order; haphazard: a random selection
2.
(statistics)

3.
(informal) (of a person) unknown: some random guy waiting for a bus
noun
4.
at random, in a purposeless fashion; not following any prearranged order
adj.

“having no definite aim or purpose,” 1650s, from at random (1560s), “at great speed” (thus, “carelessly, haphazardly”), alteration of Middle English noun randon “impetuosity, speed” (c.1300), from Old French randon “rush, disorder, force, impetuosity,” from randir “to run fast,” from Frankish *rant “a running” or some other Germanic source, from Proto-Germanic *randa (cf. Old High German rennen “to run,” Old English rinnan “to flow, to run;” see run (v.)).

In 1980s U.S. college student slang it began to acquire a sense of “inferior, undesirable.” (A 1980 William Safire column describes it as a college slang noun meaning “person who does not belong on our dormitory floor.”) Random access in reference to computer memory is recorded from 1953. Related: Randomly; randomness.
random
(rān’dəm)

see: at random