The fifteenness is unique to the icosahedron and probably valves the 15 great circles of the icosahedron.
Source: wiktionary
Fifteenness
Synonyms for "fifteenness"
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Sample sentences
2 total sentences available.
In short, the number fifteen cannot in any manner be separated from its fifteenness.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.