1.
A ~ member of a particular group or political party is an official member of that group or party, rather than someone who supports it.
I’ve been a ~ member of the Labour party for five years.
ADJ: ADJ n
2.
If you describe someone as, for example, a ~ feminist, you are emphasizing the fact that they believe strongly in and try to carry out the ideas of feminism.
ADJ: ADJ n emphasis