a.

1. 相对的，比较的
   Relative to its size, the city is sparsely populated.

   与它的面积相比，这座城市人口极为稀少。

   Nothing's fixed in this world; everything is relative.

   在这个世界上没有什么东西是固定不变的；一切都是相对的。

2. 与……有关系的，相关的[F][（+to）]
   He asked me some questions relative to the subject.

   他问了我一些有关这个题目的问题。

3. 成比例的，相应的[（+to）]
   Supply is relative to demand.

   供应是按需求而定的。

n.[C]

1. 亲戚，亲属
   My aunt is my only immediate relative.

   我姑母是我唯一的至亲。

2. 【语】关系词
   Who, what, that, etc. are relatives.

   who, what, that等是关系代词。

adj.

1. considered in relation or in proportion to something else:
   the relative effectiveness of the mechanisms is not known.
   ▸existing or possessing a characteristic only in comparison to something else.
2. Grammar  denoting a pronoun, determiner, or adverb that refers to an expressed or implied antecedent and attaches a subordinate clause to it, e.g. which.
   ▸(of a clause) attached to an antecedent by a relative word.
3. Music  (of major and minor keys) having the same key signature.
4. (of a service rank) corresponding in grade to another in a different service.

n.

1. a person connected by blood or marriage.
   ▸a species related to another by common origin.
2. Philosophy  a term or concept which is dependent on something else.