Components
円い is an exact match with one form of the following word:
丸い
BOOST
Readings : まるい    まろい   
丸い can be read in 2 ways: まるい (almost always used), まろい (rare).
1. round; circular; spherical  (丸い usu. refers to ball-shaped, and 円い to disc-shaped objects)
2. harmonious; calm  (see also: 丸く収まる)
My mastery:
My current mastery of 丸い:
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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 149,018 which gives a rank of 1,210
丸い is the most useful form. 2 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 80% of the time
• Google Japan frequency rank: 27,000 (about 23,000,000 results)
• This form appears in Wikipedia's list of JLPT N5 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 1279 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 8089
• 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 19 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:
ちきゅう
地球
まる

The earth is round.
せんせい
先生
ちきゅう
地球
まる
かれ
おし
えた

The teacher taught them that the earth is round.
せんせい
先生
ちきゅう
地球
まる
いった
The teacher said that the earth is round.
まるい
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 86,000 (about 2,820,000 results)
• Wikipedia most common 20000 words rank: 18545
• 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 19 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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円い
BOOST
Readings : まるい    まろい   
円い can be read in 2 ways: まるい (60%), まろい (40%).
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 81,000 (about 3,270,000 results)
• This form appears in Wikipedia's list of JLPT N5 vocabulary (see JLPT collections)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form is used as an example of an official Joyo kanji reading
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ガン   round; circle   まる round, circular   
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ク   キュウ   ここの nine   
dot   
エン    circle, yen   まる round   
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