thirdset

noun
UK /ˈθɜːd.sɛt/
US /ˈθɝːd.sɛt/

The third group of things that belong together.

She put the thirdset of books on the top shelf.


OTHER MEANINGS

2. The third round of games in a sports match.

They won the thirdset and took the lead.

3. The third matching outfit or item in a series.

He packed the thirdset of clothes for the trip.

4. The third group of data or results in a study.

The thirdset of results was the most surprising.