NoMo refers to a woman who is not a mother, particularly by circumstance rather than by choice. (not + mother)

“非妈族（mot+mother）”指不是母亲的女性，她们通常不是自愿选择不做母亲，而是境况使然。

Example:

Once I'd begun to make peace with this idea, I felt I could start moving forwards. And I discovered I was far from alone. There were plenty of us so-called "NoMos" out there.

一旦我开始坦然接受，我就觉得我可以继续生活下去。而且我发现我并不是孤单一人，像我一样的“非妈族”还有很多。