Sentence:  When these fields are surveyed together , important patterns of relationship emerge indicating a vast community of <WSD>reciprocal</WSD> influence , a continuity of thought and expression including many traditions , primarily literary , religious , and philosophical , but frequently including contact with the fine arts and even , to some extent , with science . 
Meaning of the word marked with <WSD> tags:  concerning each of two or more persons or things; especially given or done in return