noun, noun or participle which takes 'suru', transitive verb
bisect; cut in two
Used for dividing something into two equal or roughly equal parts. Can be used as a noun or as a suru-verb.
線を引いて紙を両分する。
Draw a line and bisect the paper.
ケーキを両分して二人で食べた。
We cut the cake in two and ate it together.
二分 (にぶん) also means 'divide into two', but is more common and general. 両分 (りょうぶん) is less frequent and may carry a nuance of equal halves.
Compound of 両 (both, two) and 分 (divide, part). The exact historical derivation is uncertain, but the meaning is transparent from the kanji.