Obsolete spelling of their

The ordinal form of the cardinal number three; Coming after the second.

The person or thing in the third position. / One of three equal parts of a whole. / (uncountable) The third gear of a gearbox. / (music) An interval consisting of the first and third notes in a scale.

(informal) To agree with a proposition or statement after it has already been seconded. / To divide into three equal parts.

The right of an airline of one country to land in a different country and deplane passengers coming from the airline’s own country.

(US, education) The period in school that comes after second grade and before fourth grade.

Of or relating to a third party.

(video games) To intervene in a fight between two players or teams, often allowing one to easy defeat both (sometimes seen as unfair).

(music) a major third in the final tonic chord of a minor-key passage, a device mostly used in Baroque, although occasionally in Classical music, and then adopted much later on in neoclassicism.

An approach or solution which strives for an alternative to or middle ground between two opposing viewpoints.