third UK /θɜːd/US /θɚd/noun 8verb 2adjective 1forms 3phrases 4 noun8 •the person or thing that comes after the second and before the fourthJones came in third. •One of three equal parts of a whole.He ate a third of the pie. Divided by two-thirds. •Ellipsis of third gear (of a gearbox).Now put it into third. •third baseThe play ended with Jones standing on third. •An interval consisting of the first and third notes in a scale.They sing in thirds. •A third-class degree, awarded to the lowest achievers in an honours degree programme •A handicap of one stroke every third hole. •(no longer used) One sixtieth of a second, i.e., the third in a series of fractional parts in a sexagesimal number system.[…] thirds (sixtieths of seconds), fourths (sixtieths of thirds) and so on, but then it becomes very cumbersome. — 1994 verb2 •(informal) To agree with a proposition or statement after it has already been seconded. •To divide into three equal parts. adjective1 •The ordinal form of the cardinal number three; Coming after the second.The third tree from the left is my favorite. formsthirded · thirding · thirds Phrases with third third-ratePoor, shoddy; less than second-rate. third handHaving been relayed by two intermediate sources. third stringbelonging to the third string of a team; one who plays behind the first and second strings. third wheelA person or thing that serves no useful purpose.