Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Late Latin
Origin: Greek, from horizein 'to limit'

horizon

noun
     
ho‧ri‧zon
1

the horizon

DN the line far away where the land or sea seems to meet the sky
on the horizon
We could see a ship on the horizon.
! Do not say 'in the horizon'. Say on the horizon.
2

horizons

[plural] the limit of your ideas, knowledge, and experience
broaden/expand somebody's horizons
a course of study that will broaden your horizons
3

on the horizon

to seem likely to happen in the future:
Business is good now, but there are a few problems on the horizon.

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