* A building material: A mixture of cement, sand, gravel, and water that hardens into a solid mass, used for building foundations, roads, and other structures.
* Specific or definite: Used to describe something that is clear, definite, and not abstract or theoretical. For example, "I need concrete evidence, not just vague suggestions."
It could also be:
* A foreign word: "Konkreto" might be a word in another language. To understand its meaning, you'd need to know the language it comes from.
Could you please provide more context about how you encountered the word "konkreto"? This will help me give you a more accurate answer.