Sentence:  There is a well-known <WSD>relationship</WSD> between probability and entropy which states that * * f , where \q is the probability that state ( i.e. , volume for an ideal gas ) could be reached by chance alone . 
Meaning of the word marked with <WSD> tags:  a relation between people; (`relationship' is often used where `relation' would serve, as in `the relationship between inflation and unemployment', but the preferred usage of `relationship' is for human relations or states of relatedness)