Components
急速 is an exact match with one form of the following word:
急速
BOOST
Reading : きゅうそく   
rapid (e.g. progress)
My mastery:
My current mastery of 急速:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 2 (among the 1,500 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 145,068 which gives a rank of 1,053
急速 is the most useful form. 1 additional form is shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is almost always used
• Google Japan frequency rank: 12,000 (about 58,500,000 results)
• This form appears in Wikipedia's list of JLPT N3 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 3510 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 4792
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 3 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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Example sentences:
こども
子供
じだい
時代
きゅうそく
急速
せいちょう
成長
じき
時期
です
Childhood is a period of rapid growth.
にほん
日本
けいざい
経済
きゅうそく
急速
せいちょう
成長
した

The Japanese economy developed rapidly.
そのニュース
きゅうそく
急速
ひろ
まった

The news spread fast.
きゅうそく
BOOST
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 174,000 (about 422,000 results)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 3 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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キュウ   いそ to hurry   
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シン   こころ heart   
corner
yo = to yell / say hi
ソク   はや fast   はやまる be hasty   はやめる to expedite, to hasten   すみやか speedy   
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ソク   たば bundle   たばねる to tie in a bundle   
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コウ   ク   くち mouth   
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モク   ボク   き    こ- tree   
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ダイ   タイ   おおきい big   おおいに very much   おお-    
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イチ   イツ   ひと    ひと- one   
ジン   ニン   ひと person   
stick   
move
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