What does differential mean?
Differential functions as both a noun and an adjective, and in each role it centres on the idea of a difference. As a noun, it denotes a gap or disparity between comparable quantities — most familiarly a pay differential between two groups of workers — as well as the mechanical gear assembly in a vehicle that lets its wheels turn at different speeds when cornering. In mathematics, it names an infinitesimally small change used in calculus to analyse rates of change. As an adjective, it describes anything involving or based on distinction: differential pricing charges different customers different rates, and a differential diagnosis distinguishes among possible causes of a symptom. The word derives from Latin roots meaning 'to carry apart' or 'to differ', entering English through medieval scholastic Latin. Precise and slightly technical in register, it is indispensable in economics, engineering, medicine, and mathematics wherever exact comparison matters.
A difference between amounts, levels, or values of comparable things; also the gear assembly in a vehicle that permits its driven wheels to rotate at different speeds, and in mathematics an infinitesimal increment used in calculus.
"Analysts studied the widening earnings differential between graduates and non-graduates."
Constituting or based on a difference; distinguishing between alternatives, as in differential pricing or differential diagnosis.
"The insurer applied differential premiums based on driving history."
Used when referring to multiple distinct differences or comparisons — especially in economics and statistics — or to more than one mechanical differential unit.
"The report compared wage differentials across all five regions."
Without the humble differential gear, every car turn would grind its wheels against the road — it's the reason your outer wheel can spin faster than your inner one around a corner.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of differential
Differential comes from the Latin verb 'differre', meaning 'to carry apart' or 'to differ', formed from 'dis-' ('apart') and 'ferre' ('to carry'). It entered English in the mid-17th century via Medieval Latin 'differentialis', initially in mathematical and logical contexts before extending into mechanics, economics, and medicine. It shares this root with related words including 'differ', 'difference', and 'differentiate'.
Related word forms
How differential is actually used
In formal contexts such as economics and medicine, 'differential' carries technical weight: economists speak of wage differentials, while physicians use 'differential diagnosis' to mean distinguishing between diseases with similar symptoms. In everyday British English, 'differential' can also refer informally to a car's gearbox-related component, though most speakers simply say 'diff'.
Easily confused with differential
'Differential' relates to differences or distinctions, while 'deferential' means showing polite respect and submission to someone.