noun
the whole sky; the heavens
Refers to the entire visible sky, often used in poetic or descriptive contexts. Not an everyday conversational word; more common in writing, news, or set phrases like 満天の星 (a sky full of stars).
満天の星空を見上げた。
I looked up at the star-filled sky.
満天の雲に覆われて、太陽が見えなかった。
The whole sky was covered with clouds, and the sun was not visible.