bisect

Short definition from Wiktionary

Verb

1. 1
   To cut or divide into two parts.
2. 2
   To cut or divide into two parts: To divide an angle, line segment, or other figure into two equal parts.
3. 3
   To cut or divide into two parts: To perform a binary search on files in source control in order to identify the specific change that introduced a bug etc.

Noun

1. 1
   A bisector, which divides into two equal parts.
2. 2
   An envelope, card, or fragment thereof showing an affixed cut half of a regular issued stamp, over which one or more postal markings have been applied. Typically used in wartime when normal lower rate stamps may not be available.