1.
If you talk about a ~ person or thing, you mean that they are a~.
He was shot by a ~ gunman.
ADJ: ADJ n
2.
A ~ parent is a parent who is looking after her or his child or children and who is not married or living with a partner. (mainly BRIT)
Ninety per cent of ~ parent families are headed by mothers.
= single
ADJ: ADJ n