gradient

gradient — noun

1. a measurement of how steep a surface such as a road, path, or railway line is, o

1.nounB2
Definition

a measurement of how steep a surface such as a road, path, or railway line is, often shown as a percentage on warning signs or in engineering plans

Example

The old mountain road has a 15 percent gradient that makes driving difficult in icy weather.

road sign warning: [number] percent gradient

Tuan checked the gradient of each cycling route on his app before heading out.

Common collocations
  • gentle gradient
  • steep gradient
  • [number] percent gradient
  • gradient of a road
  • gradient of a path
  • average gradient
Synonyms
  • slope

    more general; refers to any angled surface, not just the degree of steepness

  • incline

    slightly more formal; often used for man-made surfaces like ramps

  • grade

    common in North American English for road or railway steepness

  • pitch

    usually refers to the angle of a roof or staircase

Antonyms

Grammar Patterns

[adjective] gradient

[number] percent gradient

gradient of [noun]

Usage Note

Frequently used with a specific percentage (e.g., 'a 10% gradient') or with adjectives such as steep or gentle. Road, railway, and hiking contexts are the most common for this sense.

Common Mistakes

The gradient of this hill is very gradient.
The gradient of this hill is very steep.
'Gradient' is a noun, not an adjective. Use 'steep' or 'gentle' to describe the degree of a gradient.

2. the speed at which a measurable property such as temperature, air pressure, or c

2.nounC1
Definition

the speed at which a measurable property such as temperature, air pressure, or chemical concentration increases or decreases as you move from one location to another

Example

Farmers in the valley monitor the temperature gradient each spring to protect crops from frost.

collocation: temperature gradient

The pressure gradient inside the hurricane drove winds at over 150 kilometres an hour.

collocation: pressure gradient

Common collocations
  • temperature gradient
  • pressure gradient
  • concentration gradient
  • thermal gradient
  • salinity gradient
  • density gradient
  • vertical gradient
  • steep gradient (in scientific context)
Synonyms
  • rate of change

    broader term; can apply to any variable over any dimension, not just spatial

  • differential

    mathematical term for an instantaneous rate of change

  • slope

    used in mathematics for the steepness of a line on a graph, which represents a rate of change

Grammar Patterns

[quantity] gradient

gradient of [quantity]

gradient across [region]

Usage Note

The specific quantity is named before 'gradient' (e.g., temperature gradient, salinity gradient). This sense is most common in scientific writing — meteorology, oceanography, physics, and chemistry. Distinguish from sense 1 (STEEPNESS OF SLOPE), where 'gradient' refers to the physical steepness of a surface rather than the rate of change of an abstract quantity.

Common Mistakes

The temperature grade across the room was 5 degrees.
The temperature gradient across the room was 5 degrees.
'Grade' refers to a level, quality, or rank; 'gradient' is the correct term for a rate of change of a physical quantity over distance.

Word family

Synonym discussion

Sense: noun/1

Slope, incline, grade, and gradient all describe a surface that is not flat, but they differ in how specific and technical they are. Slope is the most general word — you can talk about a ski slope, a garden slope, or the slope of a roof in casual conversation. Incline is slightly more formal and often describes man-made surfaces such as ramps or walking paths; it highlights the idea of rising upward. Grade is the preferred term in North American English for the steepness of a road or railway, especially when expressed as a percentage (e.g., 'a 6% grade'). Gradient is the most technical of the four: in everyday British English it appears on road warning signs ('steep gradient') and in engineering contexts, while in scientific writing it refers to the rate of change of a physical quantity such as temperature or pressure. For example, you would say 'the road has a steep gradient' or 'the temperature gradient in the atmosphere' — but you would not use slope or incline for the latter.

slopeincline ↗grade ↗gradient ↗

Common collocations

Nouns

  • gradient measurement
  • gradient change

Phrases

  • steep gradient
  • gradient of [number] percent
  • gradient in [quantity]

Prepositions

  • gradient of
  • gradient across
  • gradient between

Etymology

LatinFrenchEnglish

Gradient entered English in the early 19th century from French 'gradient', formed from Latin 'gradiēns' (stepping, walking), the present participle of 'gradī' (to step, to walk). The core idea of 'stepping' or 'moving gradually' connects to the modern senses: the steepness of a slope tells you how much you step upward as you move forward, and a scientific gradient measures how much a quantity changes as you 'step' from one point to another. The same Latin root 'gradus' (step, degree) gave English 'grade', 'gradual', and 'graduate'.