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[trahy-sekt, trahy-sekt] /traɪˈsɛkt, ˈtraɪ sɛkt/
verb (used with object)
to divide into three parts, especially into three equal parts.
Origin of trisect
1685-95; tri- + -sect < Latin sectus, past participle of secāre to cut, sever; see section
Related forms
trisection, noun
trisector, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for trisect
  • 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.
British Dictionary definitions for trisect


(transitive) to divide into three parts, esp three equal parts
Derived Forms
trisection (traɪˈsɛkʃən) noun
trisector, noun
Word Origin
C17: tri- + -sect from Latin secāre to cut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for trisect

1660s (implied in trisection), from tri- "three" + Latin sectus "cut," past participle of secare "to cut" (see section (n.)). Probably patterned on bisect.

Online Etymology Dictionary, © 2010 Douglas Harper
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