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radiate

/ˈreɪdieɪt//ˈreɪdieɪt/·verb
to send out light, heat, or energy from a centre in all directions
Fig. 1 — I stand in a cold room where a black iron stove has just caught.
01Definition

To radiate is to send something out from a centre in every direction — most literally heat or light, which radiate from a source, but also a feeling or quality a person seems to give off (radiate confidence). From the Latin radius, 'ray' or 'spoke of a wheel', the same root as radius and radio. The picture is always of lines leaving one point outward — the opposite of rays that converge, or a force you concentrate. Heat radiates outward; a hub radiates roads; a face can radiate joy.

02In use
  • iHeat radiates from the old iron stove and slowly reaches every corner of the room.
  • iiConfidence seemed to radiate from her the moment she walked on stage.
  • iiiFrom the town square, five narrow streets radiate outward toward the walls.
03Collocations
  • radiate heat
  • radiate outward from
  • radiate confidence
  • radiate light / warmth
  • spokes radiate from a hub

Family radiation (noun) · radiant (adjective) · radiance (noun) · radiator (noun)

04Relations

=emanate, emit, beam, diffuse, give off

≠converge, concentrate, absorb

05Compared
PairThe difference
radiate vs coincidetwo independent things share the same point or time → coincide; send light, heat or energy out from a centre in all directions → radiate.
radiate vs concentratedraw scattered things inward to one point → concentrate; send light, heat or energy out from a centre in all directions → radiate.
radiate vs convergelines coming inward to a centre → converge; lines going outward from a centre → radiate.
radiate vs dispersespread a gathered mass out thin over a wide area → disperse; send light, heat or energy out evenly from a fixed centre → radiate.
radiate vs dissipatesend energy out usefully from a fixed centre → radiate; spread energy out until it fades and can do no work → dissipate.

Also compared with diverge, divide, intersect, meet, scatter, separate, split

06TOEFL & IELTS

Radiate serves two registers both tests reward: the literal science sense (heat or energy radiates from a source — useful in Task 1 process and cause-effect writing) and the figurative sense of a person radiating a quality (confidence, calm, warmth). It is usually intransitive with 'from' (light radiates from a point) but can take an object (the sun radiates energy). Keep the noun family straight — radiation is the physics noun, radiance the glow, radiant the adjective — and stress the first syllable: RAY-dee-ate.

07Asked
How do you pronounce radiate?
RAY-dee-ate — /ˈreɪdieɪt/, three syllables with the stress firmly on the first: RAY, not 'ra-DEE-ate'. The opening syllable rhymes with 'ray', the middle is a quick 'dee', and the ending keeps a full 'ate' (long /eɪt/). The adjective radiant and the noun radiation both keep the same RAY opening.
What is the difference between radiation, radiance, and radiant?
They divide the work. Radiation is the physics noun — energy sent out as rays (solar radiation, heat radiation). Radiance is the noun for a soft glow or a shining quality (the radiance of her smile). Radiant is the adjective (a radiant face, radiant heat). All three grow from radiate and the Latin radius, 'ray'.
What does 'radiating pain' mean?
Radiating pain is pain that spreads out from one spot along a path to nearby areas — for example, pain that begins in the lower back and radiates down the leg. It is the same core sense as heat leaving the stove in the scene above: something travels outward from a centre. Its opposite is 'localized' pain, which stays in one place.
Can radiate describe emotions or confidence?
Yes. Figuratively, a person can radiate a quality they seem to give off strongly: radiate confidence, calm, warmth, joy, even anger. The picture is the same as light leaving a source — the feeling pours out of them and others sense it nearby. It is a vivid choice for Speaking and for descriptive Writing.
What is the difference between radiate and emanate?
They overlap and often swap. Radiate stresses rays going out in every direction from a centre (heat radiates from a fire). Emanate stresses something issuing from a source, often invisibly and in one general flow (a smell emanates from the kitchen; calm emanates from her). Radiate is the more physical and more directional of the two.
What are some synonyms for radiate?
For sending out light or heat: emit, give off, beam, shine. For spreading from a centre: emanate, diffuse, spread out. For a person's quality: exude, project. Choose by what is travelling — you emit heat, you exude confidence, and roads radiate from a hub.