Definition of on the horizon
- Scientists believe that a major breakthrough is on the horizon.
: the line where the earth seems to meet the sky : the apparent junction of earth and sky
: the great circle on the celestial sphere formed by the intersection of the celestial sphere with a plane tangent to the earth's surface at an observer's position — see azimuth illustration
: range of perception or experience
What made you want to look up on the horizon? Please tell us where you read or heard it (including the quote, if possible).