• WordNet 3.6
    • n paramountcy the state of being paramount; the highest rank or authority
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Century Dictionary and Cyclopedia
    • n paramountcy The condition or rank of being paramount.
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In literature:

But it is this very paramountcy which the extremists deny to Great Britain.
"India, Its Life and Thought" by John P. Jones
For the rest, the career of Joseph Chamberlain, like that of Joseph Cowen, has its explanation in the passion for paramountcy.
"Bygones Worth Remembering, Vol. 1 (of 2)" by George Jacob Holyoake