Ma'anar ƙamus na "Chemistry na mutum-mutumi" yana nufin alaƙar motsin rai, jiyya, ko haɗin kai da ke tsakanin mutane biyu ko fiye. Hakanan yana iya komawa ga fahimtar juna, mutuntawa, da sauƙin sadarwa waɗanda mutane ke samu lokacin da suke hulɗa da juna. Ainihin, sinadarai tsakanin mutum-mutumi shine haɗin kai mai ƙarfi kuma galibi wanda ba a iya bayyana shi wanda mutane ke ji lokacin da suke haɗuwa da wasu akan matakin zurfi.