I want to know the answer to the following question:
What is 'haecceity'?
All the background I'm provided with is that "This in no way conflicts with the fallibility and revisability of scientific concepts, since it is only the immediate percept in its unique individuality or "thisness" – what the Scholastics called its haecceity – that stands beyond control and correction.". Is that enough to answer the question?
Answer: yes