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Meticulous
means paying extremely careful attention to detail, being precise, and ensuring that every part of something is perfect or done correctly.

Examples:
1- Chef Tony is so meticulous that he weighs every ingredient. When asked for a pinch of salt, he pulls out a calculator. His friends joke he should have a show called “The Science of Salting.
2- Marie Curie was very careful in her research on radioactivity. She took detailed notes on her experiments, which helped her make important discoveries and win two Nobel Prizes.