inertial mass (noun)

1. In the science fiction novel, the spacecraft's inertial mass increased as it accelerated through space.

2. In the fantasy realm, the enchanted sword's inertial mass was so great that only a chosen hero could wield it.

3. The designer created a futuristic dress that appeared weightless due to the clever use of lightweight materials and the illusion of low inertial mass.

4. According to Greek mythology, the gods possessed the ability to alter their inertial mass, enabling them to move effortlessly or become heavy as mountains.