1. of, relating to, or belonging to the firmament; celestial or heavenly
Usage: literary or formal; archaic

Examples

• The poet gazed upward at the firmamental expanse of stars.
• Ancient astronomers mapped the firmamental sphere with remarkable precision.
• The firmamental bodies have fascinated humanity for millennia.
• She described the night sky in firmamental terms, invoking the classical cosmology.
• The firmamental vault seemed infinite and unknowable.