Ordinary people or things are normal and not special or different in any way.
I strongly suspect that most ordinary people would agree with me.
我坚定地认为大多数老百姓赞同我的观点。
It has 25 calories less than ordinary ice cream.
它的热量比普通的冰淇淋少25卡路里。
out of the ordinary
Something that is out of the ordinary is unusual or different.
The boy's knowledge was out of the ordinary.
这个男孩的知识面非比寻常。