The phrase "known function" refers to a specific purpose or task that is recognized or familiar to people. It implies that the function's role, behavior, or outcome is already understood or identified.
Sentences with «known function»
If people don't know the function of the business, how could they meaningfully work for it? (inc.com)
Surprisingly, the researchers still don't know the function of 149 genes in their designer genome. (cen.acs.org)
Yet scientists don't really know its function, although hypotheses range from keeping our ears clean and moist to trapping insects. (sciencemag.org)