thirdcollection

noun
UK /ˌθɜːd kəˈlekʃən/
US /ˌθɝːd kəˈlekʃən/

A third collection is the third group of things that someone gathers together.

The library added a third collection of storybooks for young readers.


OTHER MEANINGS

2. The third time items are brought together into one place.

The museum's third collection of paintings opened last spring.

3. A third group of similar things kept or shown together.

She organized her stamps into a third collection by country.

4. The third part of a series of gathered works.

Fans waited eagerly for the third collection of the author's poems.