Dual
/ˈdjuːəl/noun
Consisting of two parts, elements, or aspects.
Did you know?English *dual* ultimately comes from the Latin *dualis*, built from *duo* meaning “two,” and it shares a deep Indo-European root with words like *twice* and *between*—language has been obsessed with pairs for millennia.
Etymological Timeline
Proto-Indo-European
PIE
*dwóh₁
“two”
Latin
Latin
duo
“two”
Classical Latin
Latin
dualis
“of two, consisting of two”
Late Latin / Old French
French
dual
“dual, having two parts”
16th Century
English
dual
“consisting of two parts or elements”
Modern English
English
dual
“having two parts, aspects, or functions”