1. next after the second; being the ordinal number for three.
2. being one of three equal parts.
3. of, relating to, or operating at the gear transmission ratio at which the drive shaft speed is greater than that of second gear for a given engine crankshaft speed, but not as great as that of fourth gear, if such exists: third gear.
4. rated, graded, or ranked one level below the second: He's third engineer on the ship.

5. a third part, especially of one (1/3).
6. the third member of a series.
7. third gear: Don't try to start a car when it's in third.
8. a person or thing next after second in rank, precedence, order: The writer of the best essay will receive a gold medal, the second a silver, and the third a bronze.
9. Usually thirds .Law.
• the third part of the personal property of a deceased husband, which in certain circumstances goes absolutely to the widow.
• a widow's dower.
10. Music.
• a tone on the third degree from a given tone (counted as the first).
• the interval between such tones.
• the harmonic combination of such tones.
11. third base.
12. a product or goods below second quality.

13. in the third place; thirdly.

• coming after the second and preceding the fourth in numbering or counting order, position, time, etc; being the ordinal number of three: often written 3rd
• (as noun)
2. rated, graded, or ranked below the second level
3. denoting the third from lowest forward ratio of a gearbox in a motor vehicle

• one of three equal or nearly equal parts of an object, quantity, etc
• (as modifier)
5. the fraction equal to one divided by three (1/3)
6. the forward ratio above second of a gearbox in a motor vehicle. In some vehicles it is the top gear
• the interval between one note and another three notes away from it counting inclusively along the diatonic scale
• one of two notes constituting such an interval in relation to the other
8. an honours degree of the third and usually the lowest class
9. goods of a standard lower than that of seconds

10. in the third place

11. as the third point: linking what follows with the previous statements as in a speech or argument

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