digital root
Mathematics
noun
The digit obtained when all the digits of a number are added and the process is repeated on successive results until the outcome is a single digit.
Origin
Early 20th century.
- air-stove
- airstream
- air strike
- air striking force
- airstrip
- air support
- air suspension
- airt
- air taxi
- air terminal
- air terminus
- air thermometer
- airtight
- airtightly
- airtightness
- airtight stove
- airtime
- air-to-air
- air-to-ground
- air tool
- air-to-surface
- air traffic
- air traffic control
- air traffic controller
- Air Training Corps