界 means 'world'

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Strokes : 9    Frequency: 150   JLPT: N4    Usefulness: 2    Study set: 2-4    Grade: 3   Intermediate lesson: 9    Beginner lesson: -   Begins 12 words   Used in 360 words   Used in 168 names   Component in 1 kanji (0 Jōyō)
Jōyō (常用)
⿱   rice field   mediate  
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In the most useful 10,000 words in Japanese, 界 is used 7 times, read 1 way.
Across all words in Japanese, 界 is used 355 times, read 1 way (with 1 variation).
カイ : 349 words FIND ALL
1. the world; society; the universe
2. sphere; circle; world
(click the word to view an additional 2 meanings, examples and links)
カイ (read as がい) : 6 words FIND ALL
1. the three realms of existence  (see also: 欲界, 色界, 無色界; Buddhist term)
2. the whole universe (of a billion worlds) that Buddha enlightened  (see also: 三千大千世界; Buddhist term; abbreviation)
(click the word to view an additional 2 meanings, examples and links)
An additional 6 less common words include 界 but the reading has not yet been categorized.
Henshall: 260 (originally: 240)  Joy o' Kanji : 240  Key to Kanji: 104 

Cascading kanji view

カイ    world   
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カイ    mediate   
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katakana 'no'; whereupon; splitting away from
ジン   ニン   ひと man   
デン   た rice field   
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