Definition of radiate in English:


Line breaks: ra¦di|ate


Pronunciation: /ˈreɪdɪeɪt
  • 1 [with object] Emit (energy, especially light or heat) in the form of rays or waves: the hot stars radiate energy
    More example sentences
    • At each groove, plasmons scatter and radiate some light, while some plasmon energy remains to travel to the next groove.
    • Why is that electrons radiate electromagnetic energy when they are accelerated?
    • If a particle moves faster than the speed of light, it must create a shockwave, and radiate energy.
    emit, give off/out, send out/forth, discharge, scatter, diffuse; shed, cast, beam out
  • 1.1 [no object, with adverbial of direction] (Of light, heat, or other energy) be emitted in the form of rays or waves: the continual stream of energy which radiates from the sun
    More example sentences
    • In excited atoms, energy radiated as photons eventually leaks into the vast interstellar spaces and redshifts away.
    • The air in the field became warm and comforting, the light becoming so bright that you could feel the heat radiating.
    • Even though it was around five in the afternoon, heat was still radiating off the pavement and by the time I got home about ten minutes later, I was already drenched in sweat.
    shine, be diffused, beam, emanate
  • 1.2(Of a person) clearly emanate (a strong feeling or quality) through their expression or bearing: she lifted her chin, radiating defiance
    More example sentences
    • Greg never could put his finger on it, but she just radiated a good feeling and friendship when she was near.
    • Helen simply radiates happiness and there is a great sense of satisfaction and self-ease about her.
    • He was red in the face and he was practically radiating anger and hurt.
    display, show, exhibit, demonstrate; transmit, emanate, breathe, be a/the picture of
  • 1.3 (radiate from) (Of a feeling or quality) emanate clearly from: leadership and confidence radiate from her
    More example sentences
    • There was a reassuring air about him, a comforting quality that he seemed to radiate from within.
    • She was quiet, the depression and despair radiating from her body in a way that was painful just to be near.
    • He has continued to press calmly forward despite almost deranged hatred radiating from enemies.
  • 2 [no object, with adverbial of direction] Diverge or spread from or as if from a central point: he ran down one of the passages that radiated from the room
    More example sentences
    • The volumes are arranged in a vaguely cruciform plan, with wings radiating out from a central core.
    • I was back recently to the Round Room under the heavy drum of the central rotunda from which the Four Courts radiate.
    • The building has an original design, with a central administrative section, and radiating out from this, the elementary school building, the high-school building and the gym.
    spread out, fan (out), ray (out), branch (out/off), diverge, extend, separate, split off, issue
    technical divaricate, ramify
  • 2.1 (as adjective radiated) Used in names of animals with markings arranged like rays, e.g. radiated tortoise.
  • 2.2 Biology (Of an animal or plant group) evolve into a variety of forms adapted to new ways of life.
    More example sentences
    • During this time, the mammals radiated and evolved, but they could not make the breakthrough to becoming large or to diversifying their modes of like.
    • From there, the species has radiated into several subspecies, two of which occur in Europe and share a hybrid zone.
    • In any case, these animals quickly radiated into an extraordinary variety of large and small terrestrial herbivores and carnivores.


Pronunciation: /ˈreɪdɪət
rare Back to top  
  • Arranged in or having a radial pattern: the radiate crown
    More example sentences
    • The flowers of the outer whorl of the head generally have five elongated petals united to form straplike structures and are restricted to the periphery of the radiate head.
    • Cronos glared up into the tree of life's radiate rainbow colored leaves.



sense 1 of the verb.
More example sentences
  • Because its application does not require any model calculations of atmospheric radiative transfer, it is computationally fast and can, thus, be efficiently applied to calculate UV irradiation across a grid-point net.
  • Most commonly, this necessary absorption and radiative dispersal of heat is handled by a heatsink & fan, used in conjunction with a thin layer of thermal compound.
  • Due to the near-field nature of the coupling, signals can be guided around 90° corners and split via tee structures without radiative losses into the far field at the discontinuity.


early 17th century: from Latin radiat- 'emitted in rays', from the verb radiare, from radius 'ray, spoke'.

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