n. A woman who is not a mother, particularly by circumstance rather than by choice.
Now there is even a new word for people like myself, Jennifer and the one in five women who find themselves in their mid-40s without children: NoMos, short for "not mothers."
—Amanda Revell Walton, “Like Jennifer Aniston, I've accepted I'll never be a mum — why can't you?,” Daily Express, September 04, 2014
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' (Not Mothers) out there.
—Rachel Lloyd, “'Why, aged 40, I'm finally happy to be a NoMo (that's a Not Mother)',” The Telegraph, August 15, 2014
2011 (earliest)
Because it's time we celebrated the role that NoMos (not-mothers) contribute to the world! We have so much to offer, and so many of us are!
—Jody Day, “Role Models,” Gateway Women, August 09, 2011