noun

1. The person or thing in the third position.

   “Jones came in third.”

2. One of three equal parts of a whole.

   “He ate a third of the pie. Divided by two-thirds.”

3. The third gear of a gearbox.

   “Now put it into third.”

Synonyms: ⅓, third gear

verb

1. To agree with a proposition or statement after it has already been seconded.

2. To divide into three equal parts.

adjective

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

   “The third tree from the left is my favorite.”

Synonyms: 3d, 3rd, III, IIIrd