| third | the third from the lowest forward ratio gear in the gear box of a motor vehicle |
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| third | a group of people who try actively to influence legislation |
| third | action and reaction are equal and opposite |
| third | law stating that the entropy of a substance approaches zero as its temperature approaches absolute zero |
| third | a political party organized in opposition to the major parties in a two-party system |
| third | someone other than the principals who are involved in a transaction |
| third | the third period of play in a game |
| third | pronouns and verbs that are used to refer to something other than the speaker or addressee of the language in which they occur |
| third | the product of three equal terms |
| third | a rail through which electric current is supplied to an electric locomotive |
| third | the Nazi dictatorship under Hitler (1933-1945) |
| third | (baseball or softball) the person who plays third base |