/ həˈraɪzn; NAmE / noun
1.
the horizon [ sing. ] the furthest that you can see, where the sky seems to meet the land or the sea :
The sun sank below the horizon.
A ship appeared on the horizon.
2.
[ C , usually pl. ] the limit of your desires, knowledge or interests :
She wanted to travel to broaden her horizons .
The company needs new horizons now.
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IDIOMS
- on the horizon
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WORD ORIGIN
late Middle English : via Old French from late Latin horizon , from Greek horizōn (kuklos) limiting (circle).