Components
たしか is an exact match with one form of the following word:
確か
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Reading : たしか   
1. sure; certain; positive; definite
2. reliable; trustworthy; safe; sound; firm; accurate; correct; exact
3. If I'm not mistaken; If I remember correctly; If I remember rightly
My mastery:
My current mastery of 確か:
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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 159,734 which gives a rank of 377
確か 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 90% of the time
• Google Japan frequency rank: 6,000 (about 153,000,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 862 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 8409
• 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 2 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:
かのじょ
彼女
そこいた
たし

That she was there is certain.
たし

Are you crazy?
たし
きました

I did write to him.
たしか
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My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 37,000 (about 15,300,000 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 2 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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BOOST
Reading : たしか   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 20,000 (about 31,600,000 results)
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慥か
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Reading : たしか   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 248,000 (about 14,100 results)
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カク   たし certain   たしかめる to make certain   
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crane; flying bird
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little bird
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cover; covered   
セキ   シャク   コク   いし stone   
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whereupon one
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katakana 'no'; whereupon; splitting away from
イチ   イツ   ひと    ひと- one   
コウ   ク   くち mouth   
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