horizon
nounUK /həˈraɪ.zən/
US /həˈraɪ.zən/
The line far away where the sky seems to meet the ground or sea.
We watched the sun sink below the horizon.
OTHER MEANINGS
2. The limit of what a person knows, experiences, or expects.
Traveling abroad broadened her horizons.
3. A layer of soil or rock at a particular depth.
The scientists studied the dark horizon of soil beneath the topsoil.
4. The range of a subject or field of activity.
New technologies opened up fresh horizons in medicine.