What is the meaning of bi?

noun

• A heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals.
  • synonyms: bismuth, atomic number 83
• A vehicle carrying many passengers; used for public transport.
  • usage: "he always rode the bus to work"
  • synonyms: bus, autobus, coach, charabanc, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle
• The topology of a network whose components are connected by a busbar.
  • synonyms: bus topology, bus
• An electrical conductor that makes a common connection between several circuits.
  • usage: "the busbar in this computer can transmit data either way between any two components of the system"
  • synonyms: busbar, bus
• A car that is old and unreliable.
  • usage: "the fenders had fallen off that old bus"
  • synonyms: bus, jalopy, heap