Is there any words can describe breakfast, lunch and dinner all together
For example, I have breakfast, lunch and dinner at home. Can I say I have meals at home ？or in other words, how a native speaker express it

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Yes, meals is the correct word.  You could say 'I have all my meals at home. '

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Hello! For example - breakfast is the most important meal in the day. Yes, we can say "meal" about breakfast, and "meals"  about all together .

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Yes, you could say 'I have all my meals at home', or simply 'I eat at home'.