[ verb bahy-sekt, bahy-sekt; noun bahy-sekt ]
/ verb baɪˈsɛkt, ˈbaɪ sɛkt; noun ˈbaɪ sɛkt /

verb (used with object)

to cut or divide into two equal or nearly equal parts.
Geometry. to cut or divide into two equal parts: to bisect an angle.
to intersect or cross: the spot where the railroad tracks bisect the highway.

verb (used without object)

to split into two, as a road; fork: There's a charming old inn just before the road bisects.


Also called split. Philately. a portion of a stamp, usually half, used for payment of a proportionate amount of the face value of the whole stamp.

Origin of bisect

1640–50; bi-1 + -sect < Latin sectus, past participle of secāre to cut, sever; see section

Related forms

bi·sec·tion, nounbi·sec·tion·al, adjectivebi·sec·tion·al·ly, adverb

Can be confused

bisect dissect Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for bisect

British Dictionary definitions for bisect


/ (baɪˈsɛkt) /


(tr) maths to divide into two equal parts
to cut or split into two

Derived Forms

bisection (baɪˈsɛkʃən), noun

Word Origin for bisect

C17: bi- 1 + -sect from Latin secāre to cut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for bisect


[ bīsĕkt′, bī-sĕkt ]

To cut or divide into two parts, especially two equal parts.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.