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non-monotonic
non-monotonic adj.
Brit. 
/ˌnɒnmɒnəˈtɒnɪk/
, /ˌnɒnmɒnəˈtɒnɪk/U.S. /ˌnɑnˌmɑnəˈtɑnɪk/
/ˌnɑnˌmɑnəˈtɑnɪk/ΚΠ
1915 Ann. Math. 17 50 B(t), being supposed non-monotonic, will have either a maximum or a minimum.
1988 European Sociol. Rev. 4 101 These assumptions imply that the founding rate is a nonmonotonic function of density.
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