Correct spelling for the English word "HIWISC" is [hˈɪwɪsk], [hˈɪwɪsk], [h_ˈɪ_w_ɪ_s_k] (IPA phonetic alphabet).
HIWISC is not a widely recognized term in the English language, and it does not have an official dictionary definition. There is a possibility that it could be an acronym or abbreviation specific to a certain context or field. Without more information about the context or usage, it is challenging to provide an accurate definition.
However, based on a few assumptions, we can speculate a potential definition. Given that "HI" is a common abbreviation for "High" and "WISC" might be an abbreviation for the "Wechsler Intelligence Scale for Children" (a well-known IQ test for children), it is possible that "HIWISC" could refer to a high level of performance or expertise on the WISC.
In this hypothetical definition, HIWISC could be used to describe individuals who have achieved exceptional scores on the WISC, indicating above-average cognitive abilities and a high level of intelligence.
Nevertheless, without additional information or a specific context, it is impossible to determine the exact meaning and usage of "HIWISC". If you could provide more details or clarify the context, it would be helpful in providing a more accurate and tailored definition.