Components
こととする is an exact match with one form of the following word:
こととする
BOOST
1. to devote oneself; to do one thing exclusively; to make a job of
2. to decide to  (see also: 事にする; often written with kana only)
My mastery:
My current mastery of こととする:
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Usefulness and usage:
Kanshudo usefulness level: 6 (among the 15,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 76,787 which gives a rank of 14,311
こととする is the most useful form. 1 additional form is shown below.
• This form is almost always used
• Google Japan frequency rank: 500 (about 2,680,000,000 results)
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Example sentences:
きてい
規定
てきよう
適用
ほんねん
本年
しがつ
四月
そきゅう
遡及
して
おこな
こととする
The regulation will be applied retroactively to April of this year.
事とする
BOOST
Reading : こととする   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 18,000 (about 35,800,000 results)
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ジ   ズ   こと thing; matter   
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