What is 'proper meaning'? Only a single brand of egg in my supermarket is genuinely free range per the definition supplied by our agricultural scientists (CSIRO, Australia) - less than 1500 hens per hectare. "Free range" can mean anything up to 10,000 hens per hectare.
https://beterleven.dierenbescherming.nl/
They have a code in my country that is pretty simple from 1 to 3. The highest tier is 11 chickens per square meter apparently (I do not eat poultry myself).