Components
かいこう is an exact match with one form of the following word:
開講
BOOST
Reading : かいこう   
1. holding a course (of lectures); offering a course
2. beginning a series of one's lectures; starting a new course
My mastery:
My current mastery of 開講:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 7 (among the 20,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 62,946 which gives a rank of 15,204
開講 is the most useful form. 1 additional form is shown below.
• This form is almost always used
• Google Japan frequency rank: 27,000 (about 23,000,000 results)
• Wikipedia most common 20000 words rank: 17643
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 28 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:
1年次
かいこう
開講
だいがくせい
大学生
ため
ひょうげんほう
表現法
2年次
かいこう
開講
しょくひん
食品
かがく
化学
かもく
科目
たんとう
担当
しています

I'm teaching two courses, year one's "Self-expression for University Students" and year two's "Food Chemistry".
かいこう
BOOST
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 137,000 (about 695,000 results)
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 28 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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コウ    lecture   
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ゲン   ゴン   say; word   こと word, saying   い to say   
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コウ   ク   くち mouth   
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a well again
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セイ   ショウ   い a well   
サイ   サ   ふたた again   
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