Definition of "Third" :
noun: the fielding position of the player on a baseball team who is stationed near the third of the bases in the infield (counting counterclockwise from home plate)
"He is playing third."
noun: the base that must be touched third by a base runner in baseball
"He was cut down on a close play at third."
noun: the third from the lowest forward ratio gear in the gear box of a motor vehicle
"You shouldn't try to start in third gear."
noun: the musical interval between one note and another three notes away from it
"A simple harmony written in major thirds."
noun: one of three equal parts of a divisible whole
"It contains approximately a third of the minimum daily requirement."
noun: following the second position in an ordering or series
"A distant third."
adjective: coming next after the second and just before the fourth in position
adverb: in the third place
"Third we must consider unemployment."