Despite revived interest in the study of relationships, the effect of loss of relationships in adulthood has lacked empirical study. To examine the dimensions underlying peoples' conceptions of their attachments in relationships and their reactions to the loss of relationships, 53 college students (31 females, 22 males) completed a questionnaire containing all non-redundant combinations of pairs of 20 relationships, and 15 bipolar scales. Some subjects (N=31) rated the similarity of relationships in terms of attachment, and the remaining subjects (N=22) rated the similarity in terms of loss. An individual differences multidimensional scaling analysis resulted in a two dimensional solution for attachments and for losses. While the dimensional solutions for attachments and loss were similiar, the configurations of relationships in the multidimensional space differed. The bipolar ratings indicated that the first dimension of relationships can be characterized as important versus not important. The second dimension on attachments was labled biological relation versus non-biological relation. For loss, a similiar pattern emerged. (BL)