Roget's Thesaurus: Entry 99 (Quinquesection, &c)

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#99. Quinquesection, &c. -- N. division by five &c. 98; quinquesection &c.; decimation; fifth &c.

V. decimate; quinquesect.

Adj. quinquefid, quinquelateral, quinquepartite; quinqevalent, pentavalent; quinquarticular[obs]; octifid[obs]; decimal, tenth, tithe; duodecimal, twelfth; sexagesimal[obs], sexagenary[obs]; hundredth, centesimal; millesimal &c. [obs]