1. A specific date and time by which a task, project, or obligation must be completed, with no flexibility or extension allowed
The fixed deadline for the project submission is March 31st at 5 PM.
O prazo fixo para a entrega do projeto é 31 de março às 17h.
2. An immovable time limit established in advance for the completion of work or fulfillment of a requirement
All employees must adhere to the fixed deadline set by management.
Todos os funcionários devem cumprir o prazo fixo estabelecido pela gestão.