Base can mean:

• as a noun:
  • In mathematics:
    • Base (mathematics), or radix, the number of digits in a numeral system, e.g. base 10
    • Base (geometry), the bottom of a triangle.
  • In sport:
    • Base (baseball), the 3 canvas bags and home plate
  • In architecture:
    • The bottom of a building or other structure
    • A part of some types of column, below the shaft
    • A pedestal, supporting a statue or other item
  • A defined area that contains shelter, equipment, and resources:
    • a place which helps people live in a hostile environment, such as a Moon base or a base in Antarctica
    • a Military base, which provides shelter, military equipment and personnel
  • Other uses:
    • In a transistor, the base is the controlling connection to the junction.
    • Islamic Extremist group Al-Qaeda is literally translated into English as 'The Base.'
    • Base (chemistry), the "opposite" of acid, sometimes known as an alkali

• as a verb
  • Made from the ideas of... Developed from... First known as...
  • In sport:
    • BASE jumping - jumping with a parachute from a fixed place like the top of a building or a bridge