[trahy-sekt, trahy-sekt]
verb (used with object)
to divide into three parts, especially into three equal parts.

1685–95; tri- + -sect < Latin sectus, past participle of secāre to cut, sever; see section

trisection, noun
trisector, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trisect (traɪˈsɛkt)
(tr) to divide into three parts, esp three equal parts
[C17: tri- + -sect from Latin secāre to cut]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1664 (implied in trisection), from tri- "three" + L. sectus "cut," pp. of secare "to cut" (see section). Probably patterned on bisect.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He divided the large living room into three spaces, using the beams that trisect the ceiling as a guide.
Railroad tracks trisect the neighborhood and are a dominant feature.
Already bisected by a roadway, new construction would trisect the property.
Looking down into the cylinder, mark three spots that trisect the circle evenly.
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