relative       
 noun [ C ] uk/ˈrel.ə.tɪv/ us/ˈrel.ə.t̬ɪv/
B1 亲戚,亲属
a member of your family
  I don't have many blood relatives (= people related to me by birth rather than by marriage). 我没有几个有血缘关系的亲戚。 
 All her close/distant relatives came to the wedding. 她所有的近亲/远亲都来参加她的婚礼了。 
 - More examples
 - The children are being cared for by a relative.
 - There weren't many people at the funeral - just close family relatives.
 - I live in Cambridge, but my relatives live up north in Manchester.
 - It is women who mainly shoulder responsibility for the care of elderly and disabled relatives.
 - Sundry distant relatives, most of whom I hardly recognized, turned up for my brother's wedding.
 
relative  
adjective  formal uk/ˈrel.ə.tɪv/ us/ˈrel.ə.t̬ɪv/
  (COMPARING)         
 C1 相比较而言的;比较的
being judged or measured in comparison with something else
  We weighed up the relative advantages of driving there or going by train. 我们权衡了一下,看看开车去那儿和乘火车去哪种方式更有利。 
  相对的;相比之下有的
true to a particular degree when compared with other things
  Since I got a job, I've been living in relative comfort (= more comfort than before). 自从我有了工作,日子过得就相对舒适一些了。 
 - More examples
 - The relative cheapness of foreign travel means that more people are going abroad than ever before.
 - We've lived here for 15 years, but we're relative newcomers to the village.
 - Now that the civil war is over, relative normality has returned to the south of the country.
 - He rose from relative obscurity to worldwide recognition.
 - There is a chart on the classroom wall showing the relative heights of all the children.
 
  (CONNECTED)     
relative toC2 按…的比例;与…相应
If something is relative to something else, it changes according to the speed or level of the other thing.
  The amount of petrol a car uses is relative to its speed. 汽车耗油量和其行驶速度是成比例的。