noun, takes する, intransitive verb

  1. spreading, disseminating, scattering.
  2. diffusion (of light, gas).

Variations

Pronunciation Kanji Kana Is Common
拡散 かくさん

Contained Kanji Breakdown

broaden, extend, expand
カク ひろ.がる コウ (6th, N1)
hand, hand radical (no. 64)
シュ
wide, broad, spacious
ひろ.い コウ (2nd, N4)
dotted cliff radical (no. 53)
ゲン (Kentei 1)
wild goose, trailing cliff radical (no. 27)
カン かりがね (Kentei 1)
I, myself, katakana mu radical (no. 28)
シ ボウ ム (Kentei 1)
scatter, disperse, spend
サン ち.る ばら (4th, N3)
twenty(廿) variant
month, moon
つき ゲツ ガツ (1st, N5)
strike, hit, folding chair radical variant (no. 66)
ホク (Kentei 1)
person(人) variant
mow, cut grass, subdue
ガイ ゲ おさ.める (Kentei 1)