adjective
dual
DOO-ul/ˈduːəl/
Having two parts or aspects.
The unfolding sofa has a dual purpose as seating and a bed.
Etymology
The pieces express “relating to two.” English first used dual for a grammatical form referring to two, then broadened it to things with two parts or aspects.
In context
all cars must operate a dual brake system so if one system fails the other would provide enough Force to safely stop the vehicle
More examples
- This room serves a dual purpose as an office and guest room.
- His dual citizenship lets him hold passports from both countries.
- The project has a dual focus on cost and safety.
Forms
duality noun — The state of having two aspects.
Similar words
- twofold
- Often emphasizes two aspects rather than two physical parts.
- double
- Often means twice as much, rather than having two aspects.