compound number

WordReference Random House Unabridged Dictionary of American English © 2025

com′pound num′ber, 

1. Mathematics a quantity expressed in more than one denomination or unit, as one foot six inches or one minute twenty seconds.

• 1550–60

Collins Concise English Dictionary © HarperCollins Publishers::

compound number noun

1. a quantity expressed in two or more different but related units: 3 hours 10 seconds is a compound number