1. A clear, exact, and detailed directive or set of directions that leaves no room for ambiguity or misinterpretation
The teacher gave precise instructions on how to complete the laboratory experiment.
A professora deu instruções precisas sobre como realizar o experimento de laboratório.
2. Specific guidance with exact measurements, steps, or procedures to be followed
Follow the precise instructions on the medication bottle for dosage.
Siga as instruções precisas do frasco do medicamento quanto à dosagem.