IPA: /prɪˈsaɪsɪst/
KK: /prɪˈsaɪsɪst/
The most exact or accurate in detail or measurement.
She gave the most precise instructions for the project.
Comparative: more precise
Superlative: most precise
Precise is formed from "praecisus" (meaning cut off or cut short) and the suffix "-est" (indicating the superlative degree). The word "precisest" means the most exact or sharply defined, as if it has been cut to perfection.
Think of something that is 'cut off' or 'sharply defined' — that's why 'precisest' means the most exact.