A skyline is best described as the overall or partial view of a city's tall buildings and structures consisting of many skyscrapers in front of the sky in the background. It can also be described as the artificial horizon that a city's overall structure creates. Skylines serve as a kind of fingerprint of a city, as no two skylines are alike.
OmegaWiki Dictionary
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skyline The horizontal line that appears to separate the Earth from the sky.
skyline The silhouette of a city.
skyline An operation that filters out a set of interesting points from a potentially large set of data points (A point is interesting if it is not dominated by any other point).