性 means 'sex'

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Strokes : 8    Frequency: 80   JLPT: N3    Usefulness: 3    Study set: 3-1    Grade: 5   Intermediate lesson: 7    Beginner lesson: -   Begins 153 words   Used in 1677 words   Used in 130 names   Not used as a component
Jōyō (常用)
   セイ   ショウ
Kun    さが sex, gender, nature
⿰   () heart   life  
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In the most useful 10,000 words in Japanese, 性 is used 24 times, read 2 ways.
Across all words in Japanese, 性 is used 1657 times, read 3 ways (with 1 variation).
セイ : 1584 words FIND ALL
character; personality; disposition; nature
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ショウ : 47 words FIND ALL
affinity; compatibility
(click the word to view an additional 4 forms, examples and links)
ショウ (read as じょう) : 24 words FIND ALL
will-power; guts; temper; nature; spirit
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さが : 2 words FIND ALL
1. one's nature; one's destiny
2. custom; tradition; habit
(click the word to view an additional 1 reading and 1 form, examples and links)
An additional 21 less common words include 性 but the reading has not yet been categorized.
Henshall: 745 (originally: 723)  Joy o' Kanji : 723  Key to Kanji: 593 

Cascading kanji view

セイ   ショウ    sex, gender, nature, disposition   
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セイ   ショウ    life   なま raw   いかす to enliven   いきる to live   いける to arrange flowers   うまれる to be born   う to give birth to   き pure, undiluted   お to grow, to sprout   はえる to grow, to sprout   はやす to grow, cultivate   
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