1. plural of thirtieth; the ordinal numbers corresponding to thirty in a sequence

Examples

• The thirtieths of each month are when rent payments are typically due.
• She marked all the thirtieths on her calendar for important deadlines.
• The race times were recorded to the thirtieths of a second.
• Both students finished in the thirtieths in their respective classes.
• The thirtieths represent significant milestones in the project timeline.