| relational threshold | The smallest degree of difference between two stimuli that permits them to be perceived as different. (05 Mar 2000) |
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| social problems | Situations affecting a significant number of people, that are believed to be sources of difficulty or threaten the stability of the community, and that require programs of amelioration. (12 Dec 1998) |
| International Classification of Health Problems in Primary Care | A classification of diseases, conditions and problems arranged for use in primary care where diagnostic precision is seldom possible. (05 Mar 2000) |
| sibling | Brother or sister. (13 Nov 1997) |
| sibling relations | Interactions and relationships between sisters and/or brothers. The concept also applies to animal studies. (12 Dec 1998) |
| sibling rivalry | Jealous competition among children, especially for the attention, affection, and esteem of their parents; by extension, a factor in both normal and abnormal competitiveness throughout life. (05 Mar 2000) |