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ADJ
（表示令人滿意或可以接受）不錯的，可以的
If you say that something is okay, you find it satisfactory or acceptable.
例句
...a shooting range where it's OK to use weapons...
可以使用武器的射擊場
Is it okay if I come by myself?...
我一個人來行嗎？
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ADJ
（人）安全的，健康的，無恙的
If you say that someone is okay, you mean that they are safe and well.
例句
Check that the baby's okay...
看看孩子是否還好。
'Don't worry about me,' I said. 'I'll be okay.'
“別擔心我，”我說，“我不會有事的。”
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CONVENTION
（表示同意）好的
You can say 'Okay' to show that you agree to something.
例句
'Just tell him Sir Kenneth would like to talk to him.' — 'OK.'...
“就跟他說肯尼思爵士想跟他談談。”——“好的。”
'Shall I give you a ring on Friday?' — 'Yeah okay.'
“我星期五給你打電話好嗎？”——“好的。”
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CONVENTION
（詢問對方是否領會或同意）好嗎，行嗎，明白嗎
You can say 'Okay?' to check whether the person you are talking to understands what you have said and accepts it.
例句
Add them together, divide by five, and you've got the average. Okay?...
把它們相加再除以5就是平均數，明白嗎？
We'll get together next week, OK?
我們下周聚一聚，好嗎？
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CONVENTION
（表示希望轉換話題或做別的事情）好了
You can use okay to indicate that you want to start talking about something else or doing something else.
例句
OK. Now, let's talk some business...
好了，我們現在言歸正傳吧。
Tim jumped to his feet. 'Okay, let's go.'
蒂姆一躍而起，“好了，我們走吧。”
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CONVENTION
（不情愿地表示接受對方觀點以制止其爭辯）得了，行了
You can use okay to stop someone arguing with you by showing that you accept the point they are making, though you do not necessarily regard it as very important.
例句
Okay, there is a slight difference...
行了，是略有不同。
Okay, so I'm forty-two.
得了，我就算42歲吧。
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VERB
批準；同意；允許
If someone in authority okays something, they officially agree to it or allow it to happen.
例句
His doctor wouldn't OK the trip...
醫生不會同意他去旅行。
We are all wondering why the government is suddenly okaying a brand new school on the island.
我們都很疑惑為什么政府突然批準在島上建一所新學校。