1. 循序性：gradual decline 渐降 | gradualness 循序性 | gradualness of development 发展渐进说 发展渐进说
2. 渐次的：gradually 逐渐地 | gradualness 渐次的 | graduate away 逐渐消失
3. 徐徐的：徐徐slowlygently | 徐徐的gradualness | 徐徐地inchmealinsensibly
4. 逐渐的：gradualness 徐徐的 | gradualness 逐渐的 | graduated 分度的
noun
1. the quality of being gradual or of coming about by gradual stages
Synonym: graduality
2. gradualness
2. the property possessed by a slope that is very gradual
Synonym: gentleness