International Journal of Neutrosophic Science IJNS 2690-6805 2692-6148 10.54216/IJNS https://www.americaspg.com/journals/show/713 2020 2020 Hanoi University of Natural Resources and Environment, Hanoi, VIETNAM Ngan Thi Roan Dept. Math and Sciences, University of New Mexico, Gallup, NM, USA Florentin Smarandache As an instance of a neutrosophic set, a single-valued neutrosophic set (SVNS) can be used to handle uncertainty, inaccuracy, indeterminacy, and inconsistency. In this paper, a new not-so-sophisticated distance measure between two SVNSs is defined by considering the cross-assessment between characteristic functions for the forward and backward differences. Furthermore, a single-valued neutrosophic similarity measure, a single-valued neutrosophic entropy measure, and their basic properties are presented and proven. In addition, an application to medical diagnosis is shown to illustrate the effective applicability of the proposals.   2021 2021 62 76 10.54216/IJNS.150201 https://www.americaspg.com/articleinfo/21/show/713