Components
開封 is an exact match with one form of the following word:
開封
BOOST
Reading : かいふう   
opening (an envelope or parcel); breaking the seal; unsealed letter
My mastery:
My current mastery of 開封:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 8 (among the 30,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 55,634 which gives a rank of 20,160
開封 is the most useful form. 1 additional form is shown below.
• This form is almost always used
• Google Japan frequency rank: 7,000 (about 114,000,000 results)
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 40 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:
はら
もど
ける
しょうひん
商品
かいふう
開封
まま
へんそうくだ
返送下
さい

For a refund, you must return the item unopened.
あやま
って
きみ
てがみ
手紙
かいふう
開封
した
こと
ゆる
して
くだ
さい

Please forgive me for opening your letter by mistake.
その
あさ
とど
けられた
ゆうびん
郵便
ひしょ
秘書
かいふう
開封
した

The secretary opened the mail which had been delivered that morning.
かいふう
BOOST
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 171,000 (about 437,000 results)
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 40 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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カイ   あ to (be) open   あける    ひら to open (something)   ひらける to open out (eg view)   
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start, initiate   
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イチ   イツ   ひと    ひと- one   
twenty; two hands   
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ジュウ   ジッ   と    とお ten   
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stick   
モン   かど gate   
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フウ   ホウ    seal   
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ケイ    jewel; corner   
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ド   ト   ground; earth   つち ground, earth, soil   
スン   inch
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