- 二分之一 èrfēnzhīyī one-halfone half; 1/2
- 十二分 shí'èrfēn extremelyexceedingly; used as an adverb to express a very high degree
- 二分法 èrfēnfǎ dichotomyA method of classification or analysis that divides a concept into two mutually exclusive and exhaustive categories, such as binary analysis in linguistics
- 二分明月 èrfēnmíngyuè Yangzhou's unparalleled prosperity; beautiful sceneryReferring to the city of Yangzhou as possessing two-thirds of the world's moonlight; used to describe the unparalleled prosperity and beauty of a place, or more generally, wonderful scenery
- 二分音符 èrfēnyīnfú half notehalf note; minim
- 二分点 èrfēndiǎn equinoxesThe two equinoxes.
- 三十二分音符 sānshí'èrfēnyīnfú thirty-second notedemisemiquaver; a musical note played for one thirty-second of the duration of a whole note
- 二分裂 èrfēnliè binary fissionasexual reproduction in which a single cell divides into two equal parts; binary division