radiate

IPA/ˈreɪdieɪt/
KK[rˈediət]IPA/ˈreɪdieɪt/

radiate — verb

  • radiatepresent simple I / you / we / they
  • radiateshe / she / it
  • radiatedpast simple
  • radiating-ing form

1. to send warmth, brightness, or energy outward into the surrounding area, or for

1.verbtransitive / intransitiveB2
Definition

to send warmth, brightness, or energy outward into the surrounding area, or for such warmth and brightness to flow away from a source like a fire, a lamp, or the sun.

Example

The cast-iron stove in Layla's cabin radiated a steady warmth all evening.

transitive: [object] radiates [heat/warmth]

Heat radiated from the bonfire and reached the children sitting on the grass.

intransitive: [heat] radiates from [source]

Common collocations
  • radiate heat
  • radiate light
  • radiate warmth
  • radiate energy
  • radiate outward
Synonyms
  • emit

    more technical and neutral; common in physics and science writing

  • give off

    more everyday; works for smells and gases too, not only heat or light

  • shed

    usually for light only ('shed light on the table'); not used for heat

Antonyms
  • absorb

    to take in heat or light rather than send it out

Grammar Patterns

[thing] radiates [heat/light]

[heat/light] radiates from [thing]

Usage Note

Subject is usually a physical heat or light source (stove, lamp, sun, fire). Used both transitively (the stove radiates heat) and intransitively (heat radiates from the stove); the noun naming the heat or light stays the same in both patterns.

Common Mistakes

The lamp radiated to the room.
The lamp radiated light into the room.
when used transitively, 'radiate' needs a direct object naming what is given off (heat, light, energy).

2. to give off a strong feeling or personal trait — such as joy, calm, or confidenc

2.verbtransitive / intransitiveC1
Definition

to give off a strong feeling or personal trait — such as joy, calm, or confidence — so clearly that other people can sense it just by being nearby; for example, a bride who seems to glow with happiness on her wedding day.

Example

On her wedding day, Adisa radiated a calm joy that spread through the whole hall.

transitive: [person] radiates [emotion]

Confidence radiated from Sofia as she walked to the front of the courtroom.

intransitive: [quality] radiates from [person]

Common collocations
  • radiate joy
  • radiate calm
  • radiate confidence
  • radiate warmth
  • radiate kindness
Synonyms
  • exude

    similar metaphorical sense; slightly more formal and literary

  • give off

    more informal; often used for vibes or impressions

  • project

    implies more deliberate display; 'radiate' suggests it happens naturally

Grammar Patterns

[person] radiates [emotion/quality]

[emotion/quality] radiates from [person]

Usage Note

Subject is usually a person (sometimes their face or eyes). Object is usually a positive emotion or quality (joy, calm, confidence, warmth, kindness). Distinguish from sense 1: here the 'giving off' is metaphorical — no actual heat or light is produced.

Common Mistakes

Adisa radiated angry.
Adisa radiated anger.
'radiate' takes a noun (anger, joy, calm), not an adjective.

3. to extend or spread out in many directions from one central point — used of stre

3.verbintransitiveC1
Definition

to extend or spread out in many directions from one central point — used of streets, rays, cracks, pain, or anything that fans out from a middle spot.

Example

Narrow streets radiate from the old market square in the heart of Yan's hometown.

intransitive: [streets] radiate from [central point]

Sharp pain began to radiate down Nellie's left arm during the morning run.

medical context: pain radiates down / through [body part]

Common collocations
  • radiate from
  • radiate outward
  • radiate down (the arm)
  • radiate across
Synonyms
  • spread out

    more everyday; doesn't require a clear central starting point

  • fan out

    vivid image of opening like a hand fan; usually horizontal spreading

  • branch out

    implies splitting into smaller paths along the way, not straight lines

Antonyms
  • converge

    to come together toward one central point — the opposite direction

Grammar Patterns

[lines/roads/pain] radiate from [point]

[lines] radiate outward

Usage Note

Almost always intransitive in this sense, paired with 'from + central point' or 'outward'. Common in geography (streets, roads), medicine (pain), and physics (rays, cracks). Subject is the lines or things that fan out, not the center itself.

Common Mistakes

The square radiates streets.
Streets radiate from the square.
the center is the starting point ('from'), not the subject of 'radiate'.

radiate — adjective

Word family

Synonym discussion

Sense: verb/1

All four describe sending heat, light, or energy outward, but they fit different registers and contexts. 'Radiate' suggests the energy spreads steadily in all directions and is the most vivid choice for fires, stoves, the sun, and the human body; it is at home in both everyday prose and physics. 'Emit' is more neutral and technical — laboratory equipment emits radiation, an engine emits exhaust; it sounds odd for everyday warmth. 'Give off' is the most informal partner, perfect for casual descriptions of heat, smells, or even feelings. 'Shed' is reserved almost only for light: a lamp sheds light on the table, but you would not say a stove sheds heat. When in doubt about register, use 'give off' in conversation and 'radiate' or 'emit' in written work.

radiate ↗emit ↗give off ↗shed ↗

Common collocations

Nouns

Adverbs

  • radiate outward
  • radiate evenly
  • radiate steadily
  • radiate brightly

Phrases

  • radiate in all directions
  • radiate from a central point

Prepositions

  • radiate from
  • radiate into
  • radiate through
  • radiate across

Etymology

LatinEnglish

Borrowed into English in the early 1600s from Latin 'radiatus', the past-participle form of 'radiare', meaning 'to shine, to send out rays'. The Latin root 'radius' meant a ray of light, a spoke of a wheel, or a measuring rod — and you can still hear that family of meanings today in 'radius', 'radio', 'ray', and 'radiator'. The metaphorical sense of a person 'radiating' joy or confidence developed in English in the 1800s as the literal heat-and-light meaning was extended to feelings.