random

random, casual

形容词 random:

1. lacking any definite plan or order or purpose; governed by or depending on chance
2. taken haphazardly

1. Soiled dishes were piled at random.
   脏碟子胡乱地堆放着。
2. By mere chance or fortune; at random.
   碰巧; 胡乱地; 随意地
3. A disturbance, especially a random and persistent disturbance, that obscures or reduces the clarity of a signal.
   干扰噪声一种干扰，尤指一处任意的和持续的干扰，使信号变模糊或减少
4. Marked by a lack of care, accuracy, or organization; random.
   漫无目的的缺乏谨慎、精确或组织性的; 随意的
5. The librarian took a book at random from the shelf.
   图书管理员从书架上随便拿了一本书。

ran.dom

adj.（形容词）
Having no specific pattern, purpose, or objective:
没有具体形式、目的或内容的：
例句：
random movements; a random choice.See Synonyms at chance
随意运动；一个随意的选择参见 chance

Statistics Of or relating to the same or equal chances or probability of occurrence for each member of a group.
【统计学】 随机的：同组中每个成员都有相同或平等机会或可能出现的

<习惯用语>at random
Without a governing design, method, or purpose; unsystematically:
没有统一、计划、方法或目的的；结构混乱的：
例句：
chose a card at random from the deck.
从一副牌中任意选出一张

来源：
From at random [by chance, at great speed]
源自 at random [随机地，迅速地]
from Middle English randon [speed, violence]
源自 中古英语 randon [速度，暴力]
from Old French
源自 古法语
from randir [to run]
源自 randir [跑]
[of Germanic origin]
[来源于德语]

【引伸】
ran.domly
adv.（副词）
ran.domness
n.（名词）