Components
膨張 is an exact match with one form of the following word:
膨張
BOOST
Reading : ぼうちょう   
expansion; swelling; increase; growth
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My current mastery of 膨張:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 5 (among the 10,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 90,914 which gives a rank of 6,483
膨張 is the most useful form. 3 additional forms are shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 40% of the time
• Google Japan frequency rank: 33,000 (about 17,500,000 results)
• Wikipedia most common 20000 words rank: 13099
• 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 12 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:
せかい
世界
じんこう
人口
いち
ねん
せん
まん
にん
わりあい
割合
ぼうちょう
膨張
している

The world population is expanding at the rate of nearly 90 million people a year.
おお
てんもんがくしゃ
天文学者
うちゅう
宇宙
えいえん
永遠
ぼうちょう
膨張
してゆく
もの
かんが
えている

Many astronomers assume that the universe expands infinitely.
かそく
加速
ぼうちょう
膨張
こす
せきりょく
斥力
fragment, headline etc.
repulsion that causes accelerated expansion
ぼうちょう
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 30% of the time
• Google Japan frequency rank: 41,000 (about 12,900,000 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 12 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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膨脹
BOOST
Reading : ぼうちょう   
My flashcards:
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Usefulness and usage:
• This form is used about 30% of the time
• Google Japan frequency rank: 46,000 (about 10,800,000 results)
• This form appears in Wikipedia's list of JLPT N1 vocabulary (see JLPT collections)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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ぼう張
BOOST
Reading : ぼうちょう   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 173,000 (about 429,000 results)
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ボウ   ふくらむ to swell, bulge, expand   ふくれる to swell; to sulk   
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fur, bristles, beard   
ニク body part   
ten beans
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ジュウ   ジッ   と    とお ten   
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イチ   イツ   ひと    ひと- one   
stick   
トウ   ズ   まめ bean   
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コウ   ク   くち mouth   
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grass   
チョウ   は to stretch   
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チョウ   なが long   
キュウ   ゆみ a bow   
チョウ    dilate   
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