- briefOf short duration; happening quickly.
- breveA semicircular diacritical mark (˘) placed above a vowel, commonly used to mark its quantity as short.
- brevetA military document entitling a commissioned officer to hold a higher rank temporarily, but without an increase in pay.
- brevi-Short.
- brevipenA brevipennate (short-winged) bird, in a former proposed classification, Brevipennes
- brevipennateshort-winged; having short wings.
- brevirostralHaving a short beak or bill
- brevium23491Pa, a short-lived isotope of protactinium.
- semibreveA musical note four beats long in 4/4 time; a whole note (US)