1. plural of propulsion; the action or process of driving or pushing something forward
Usage: typically used in technical or scientific contexts
2. plural of propulsion; systems or mechanisms that produce forward motion
Usage: commonly used in engineering and aerospace contexts

Examples

• Modern aircraft use jet propulsions to achieve high speeds.
• The spacecraft's ion propulsions allowed it to travel vast distances.
• Electric propulsions are becoming more common in automotive design.
• Different propulsions systems require different fuel types.
• The ship's propulsions were upgraded to improve efficiency.
• Rocket propulsions rely on the expulsion of hot gases.
• Engineers tested several propulsions designs before selecting the best one.