Of a function, associating a unique value of its range with each value of its domain.(adjective)
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Use "single-valued" in a sentence
"In general, single-valued measures such as average word length, average sentence length, or mean “reading level” tend not to work as well as multivariate measures, where you measure lots of different properties of the text, such as the frequencies of fifty or a hundred different words."
"This is by necessity, rights are written at a lofty level of abstraction who application is neither straightforward nor single-valued."
"I define racism as a single-valued, continuous mapping...."