偏 means your emotion or a certain thing slant to a direction,I guess you want to know about emotional part,because on this part,there is a distinction between 偏 and 偏偏. 偏爱 is defined in a few things or several people, one thing or a person is your favorite. eg.花园里种满了各种鲜花，我偏爱玫瑰。 偏要 means one thing is not allowed，but you insist on doing it. eg.虽然我告诉他不要做，他偏要做。 (He would do it, though I told him not to.) 正在我最忙的时候,他偏要来打搅! (Just as I was busiest, he must come bothering me.) 偏偏 means events or people's behavior are contrary to folk's expectation or common sense. eg.正当我坐下来吃晚饭时, 偏偏电话来了。 (I was sitting down to supper, the telephone just rang.)

“偏偏” ①It means: “just” sort of “by chance / happen to” / “just” “凑巧”/“恰恰”的意思 It can be used for expressing a kind of connotative moods . like, feeling helpless(无助感or无奈感) samples: 1．为什么伤害我的人，偏偏是你？ {Why are you the just person who have hurt me so badly? } 2．我多想让自己恨你,忘了你,永远不想再见你,可偏偏心里只爱你,只想一直看着你. {How I wish to let myself to hate you, forget you , never want to see you again . anyway,I cannot help but love you seriously , just wants to see you all the time… } ②It means “only”, and with something like querulous tone.(带点牢骚的口吻)or feeling unlucky samples: 1．尽管我们大家都很努力，可老师偏偏表扬她一个人。{though we all studied very hard,but she was the only person who was praised by the teacher.} 2．大家都及格了，偏偏我没有通过考试。{Everybody has gotten through the exam but me.} ③It means “against” , (to be contrary to certain circumstances by doing sth. deliberately) samples: 1．明明知道那时我心情不好,可他偏偏还要惹我生气。{He knew very well that l had bad days at that period, but still went on offending me.} 2．我相信已经把道理讲的明明白白了，可她偏偏还是执迷不悟。{I believe that I had already explained the issues clearly ,but she still refused to listen to reason.} “偏”means “slanting”/“leaning”/“deviating from” some phrases in common use： Partiality 偏爱、偏好 Remote 偏远 prejudice 偏见 deviate 偏离 character components 偏旁 would 偏要

I didn't notice this before......

“偏偏”的解释hczh解释的很详细了。“偏”字放在句子中有时候是加强语气（一般后面是直接+否定副词‘不’再+动词）：我告诉他别这样做，他偏不听/信。偏爱，近似于like best-最喜欢，是一个词不能单独理解为偏，除了 Partiality 偏爱、偏好 Remote 偏远 prejudice 偏见 deviate 偏离 character components 偏旁 would 偏要 还有“偏向”“偏听偏信”，如：他总是偏向那些讨好他的人。他总是信任那些身边人的话，这样做是偏听偏信。

两个词都是用来表达”转折“，“强调”，没有什么明显的差别。