精准 (jīngzhǔn) means 'precise and accurate', with a strong emphasis on exactness to a target or standard — it's used for data, measurements, and analysis. It's more formal and specific than 准 (zhǔn 'accurate, roughly correct') and overlaps with 准确 (zhǔnquè), but 精准 adds a nuance of 'fine-grained' or 'meticulous' precision, often in technical or scientific contexts.