1. Exactly accurate and without any error or ambiguity; absolutely exact in detail
The measurements were perfectly precise, down to the millimeter.
As medições eram perfeitamente precisas, até o milímetro.
2. Demonstrating complete accuracy in expression, execution, or description
Her instructions were perfectly precise, leaving no room for misunderstanding.
Suas instruções eram perfeitamente precisas, não deixando margem para mal-entendidos.