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1 The International Society for the Study of Individual Differences (ISSID) was founded in 1983 to foster research on individual differences in temperament, intelligence, attitudes, and abilities.
Wiktionary(0.00 / 0 votes)Rate this definition: Issa(ProperNoun) A Somali clan, mainly residing in Djibouti, where it is larger of the two dominating ethnic groups. Until its independence in 1977 Djibouti was called the French Territory of the Afars and the Issas.