Components

由 means 'reason'

Animation / stroke order not available.
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Strokes : 5    Frequency: 286   JLPT: N3    Usefulness: 3    Study set: 3-7    Grade: 3   Intermediate lesson: 20    Beginner lesson: -   Begins 15 words   Used in 166 words   Used in 2554 names   Component in 111 kanji (16 Jōyō)
Jōyō (常用)
On
   ユ   ユウ   ユイ
Kun
   よし reason
On    ユイ
Kun   
The 'last' in the mnemonic is based on similarity to upside down 'first' ( (first)).
 first   say  
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In the most useful 10,000 words in Japanese, 由 is used 7 times, read 4 ways.
Across all words in Japanese, 由 is used 165 times, read 5 ways.
Showing:
ユウ : 140 words FIND ALL
2
expression, 'na' adjective, noun
freedom; liberty; as it pleases you
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ユ : 14 words FIND ALL
0 1
adverbial noun (fukushitekimeishi)
1. through; by way of; via
2. to go via; to go by way of
(click the word to view an additional 1 reading, examples and links)
ユイ : 2 words FIND ALL
1
noun
history; pedigree; lineage
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よし : 7 words FIND ALL
1
noun
1. reason; significance; cause
2. piece of information that one has heard; I hear that ...; it is said that ...  (this meaning is restricted to form 由)
(click the word to view an additional 3 forms, examples and links)
: 2 words FIND ALL
2
Most common form: よる
'ru' godan verb, intransitive verb
1. to be due to; to be caused by  (esp. 依る, 拠る; often written with kana only)
2. to depend on; to turn on  (esp. 依る; often written with kana only)
(click the word to view an additional 2 meanings and 4 forms, examples and links)
An additional 甲 less common words include 由 but the reading has not yet been categorized.
Henshall: 421 (originally: 399)  Joy o' Kanji : 399  Key to Kanji: 1026 

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ユ   ユウ   ユイ   よし reason   
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