1.
A ~ sample or method is one in which all the people or things involved have an equal chance of being chosen.
The survey used a ~ sample of two thousand people across England and Wales...
The competitors will be subject to ~ drug testing.
ADJ: usu ADJ n
~ly
...interviews with a ~ly selected sample of thirty girls aged between 13 and 18.
ADV: ADV with v
2.
If you describe events as ~, you mean that they do not seem to follow a definite plan or pattern.
...~ violence against innocent victims...
ADJ: usu ADJ n
~ly
...drinks and magazines left scattered ~ly around.
ADV: ADV with v
3.
If you choose people or things at ~, you do not use any particular method, so they all have an equal chance of being chosen.
We received several answers, and we picked one at ~.
PHRASE: PHR after v
4.
If something happens at ~, it happens without a definite plan or pattern.
Three black people were killed by shots fired at ~ from a minibus.
PHRASE: PHR after v