1. Noun. (mathematics) A particular function, \mathrm{gd}(x)=2\tan^{-1}e^x-\frac\pi2. ¹
2. Noun. (mathematics) A particular function, \mathrm{gd}(x)=2\tan^{-1}e^x-\frac\pi2. ¹
¹ Source: wiktionary.com
