longest (adjective (superlative))
The superlative form of the adjective 'long', indicating the greatest extent in space or time. It is used to compare one item against at least two others to show it has the maximum length or duration.
"The Nile is the longest river in Africa."
Think of the 'L' in 'Longest' as a 'Leader'—it is the one that goes the furthest and leads the group in length.
The most longest river. → The longest river.
He is the longest student in class. → He is the tallest student in class.
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