A martial arts instructor. Sensei of martial arts usually live and/or work at a dojo where they instruct their apprentices. A live-in apprentice is also called uchi-deshi.

(UK, dialect, informal) Synonym of chatterbox (“talkative person”)

(algebra) An expression that gives information about the roots of a polynomial; for example, the expression D = b² - 4ac determines whether the roots of the quadratic equation ax² + bx + c = 0 are ...

(informal) Somewhat sharp (sudden, abrupt). / (informal) Somewhat sharp; not blunt.