Penta- - Definition and Overview

Penta- is a Greek prefix meaning five. The Latin equivalent is quinque-.

In plane geometry, a pentagon is a five sided figure.
In chemistry, the number of subunits of like kind attached to a central molecule, as in Pentachlorophenol, a central phenol group with five chlorine atoms attached.
A pentathlon has 5 events.
A pentatonic scale has 5 notes.
A pentomino is a figure made out of 5 squares.
The pentagram is a star with 5 points.