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."