The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\ (r[=a]"d[i^]*[=a]t), v. i. [imp. & p. p.
   Radiated (r[=a]"d[i^]*[=a]`t[e^]d); p. pr. & vb. n.
   Radiating.] [L. radiatus, p. p. of radiare to furnish with
   spokes or rays, to radiate, fr. radius ray. See Radius,
   Ray a divergent line.]
   1. To emit rays; to be radiant; to shine.
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            Virtues shine more clear
            In them [kings], and radiate like the sun at noon.
                                                  --Howell.
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   2. To proceed in direct lines from a point or surface; to
      issue in rays, as light or heat.
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            Light radiates from luminous bodies directly to our
            eyes.                                 --Locke.
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The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\, v. t.
   1. To emit or send out in direct lines from a point or
      points; as, to radiate heat.
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   2. To enlighten; to illuminate; to shed light or brightness
      on; to irradiate. [R.]
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The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\ (r[=a]"d[i^]*[asl]t), a. [L. radiatus, p.
   p.]
   1. Having rays or parts diverging from a center; radiated;
      as, a radiate crystal.
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   2. (Bot.) Having in a capitulum large ray florets which are
      unlike the disk florets, as in the aster, daisy, etc.
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   3. (Zool.) Belonging to the Radiata.
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The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\, n. (Zool.)
   One of the Radiata.
   [1913 Webster]

WordNet (r) 3.0 (2006):

radiate
    adj 1: arranged like rays or radii; radiating from a common
           center; "radial symmetry"; "a starlike or stellate
           arrangement of petals"; "many cities show a radial
           pattern of main highways" [syn: radial, stellate,
           radiate]
    2: having rays or ray-like parts as in the flower heads of
       daisies
    v 1: send out rays or waves; "The sun radiates heat"
    2: send out real or metaphoric rays; "She radiates happiness"
    3: extend or spread outward from a center or focus or inward
       towards a center; "spokes radiate from the hub of the wheel";
       "This plants radiate spines in all directions" [syn:
       radiate, ray]
    4: have a complexion with a strong bright color, such as red or
       pink; "Her face glowed when she came out of the sauna" [syn:
       glow, beam, radiate, shine]
    5: cause to be seen by emitting light as if in rays; "The sun is
       radiating"
    6: experience a feeling of well-being or happiness, as from good
       health or an intense emotion; "She was beaming with joy";
       "Her face radiated with happiness" [syn: glow, beam,
       radiate, shine]
    7: issue or emerge in rays or waves; "Heat radiated from the
       metal box"
    8: spread into new habitats and produce variety or variegate;
       "The plants on this island diversified" [syn: diversify,
       radiate]