苒苒 meaning in Chinese

[书面语]
1.(草茂盛) luxuriant
2.(草木枝叶柔嫩; 轻柔) tender; pliable
3.(气味或烟尘轻飘的样子) lightly floating
4.(渐渐地) gradually
5.(时间悄然流逝的) imperceptibly passing