名詞 correlation:

1. a reciprocal relation between two or more things
   同義詞：correlativity
2. a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation)
   同義詞：correlation coefficient, coefficient of correlation
3. a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
   同義詞：correlational statistics

1. The study of correlations between the mind, behavior, and bodily mechanisms.
   精神生理學研究心靈、行為和身體機制之間相互關系的學科
2. Related by a correlation, especially having corresponding characteristics.
   相應特點相互聯(lián)系的，尤指具有相應特點的
3. Be you familiar with their correlation?
   你了解他們的相互關系嗎？

cor.re.la.tion

n.（名詞）
A causal, complementary, parallel, or reciprocal relationship, especially a structural, functional, or qualitative correspondence between two comparable entities:
相互關聯(lián)：一種互為因果的、互相補充的、平行或互惠的關系，尤指結構上、功能上數(shù)量上兩個可比方面之間的相應關系：
例句：
a correlation between drug abuse and crime.
吸毒和犯罪之間的相互關聯(lián)

Statistics The simultaneous change in value of two numerically valued random variables:
【統(tǒng)計學】 相關性：兩個隨機交化的數(shù)值在數(shù)值上的同時交化：
例句：
the positive correlation between cigarette smoking and the incidence of lung cancer; the negative correlation between age and normal vision.
吸煙與肺癌發(fā)病的正比關系；年齡與正常視力之間的反比關系

An act of correlating or the condition of being correlated.
相關行為：相互關聯(lián)的行為或相互關聯(lián)的狀況

來源：
Medieval Latin correl3tiô correl3tiôn-
中世紀拉丁語 correl3tiô correl3tiôn-
Latin com- [com-]
拉丁語 com- [共同]
Latin rel3tiô [relation, report] from rel3tus [past participle of] referre [to carry back] * see relate
拉丁語 rel3tiô [關系、報告] 源于 rel3tus [] referre的過去分詞 [取回] *參見 relate

【引伸】
cor.rela.tional
adj.（形容詞）