Top-level meaning

tŏplĕvəl
Of or relating to people of the highest office or rank.
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Of or relating to the highest office or rank.

A top-level job.

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Of or by persons of the highest office or rank.
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In the highest office or rank.
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(Internet) Primary; a web page that is directly accessible by typing its name, not followed by any additional information.
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Origin of top-level