third
third1 /θɜːd $ θɜːrd/ 
adjective
in the third century
her third birthday
2. third time lucky British English, (the) third time’s the charm American English spoken used when you have failed to do something twice and hope to be successful the third time
—third pronoun:
I’m planning to leave on the third (=the third day of the month).
—thirdly adverb
third2 noun [countable]
1. one of three equal parts of something:
Divide it into thirds.
third of
A third of these jobs are held by women.
one-third/two-thirds
Two-thirds of the profits are given to charities.
2. the lowest type of degree that is given by a British university
| I |
adjective Language: Old English
Origin: thridda, thirdda
1. coming after two other things in a series:Origin: thridda, thirdda
2. third time lucky British English, (the) third time’s the charm American English spoken used when you have failed to do something twice and hope to be successful the third time
—third pronoun:
—thirdly adverb
| II |
noun [countable]1. one of three equal parts of something:
third of
one-third/two-thirds
2. the lowest type of degree that is given by a British university