During the afternoon, my cats are content to nap on the couch.What is the meaning of these sentence?

Content is the meaning of "the amount of a substance that something contains".Is it right?But I don't understand meaning of word "content" in these sentence.

Content here means satisfied. below I posted several meanings for content, Noun, adverb, and verb.

Content has several meanings:
noun

the things that are inside something such as a box, bottle, building, or room
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the things that are written in a book, magazine, letter, document, etc.
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a list at the beginning of a book or magazine, showing the parts into which the book or magazine is divided
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the subject, ideas, or story that a piece of writing or a radio or television program deals with
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any material, such as writing, pictures, or music, that appears on a website or cd-rom
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the amount of a substance that something contains
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adjective

happy and satisfied with your life
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satisfied and willing to accept a situation, and not wanting anything more or better
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verb

to make someone feel happy or satisfied
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noun

a feeling of happiness and satisfaction
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In the sentence you provided, the word "content" has a different meaning than the one you mentioned. Here, "content" is used as an adjective to describe the state or condition of the cats.

In this context, "content" means that the cats are happy, satisfied, and at ease. It suggests that the cats are comfortable enough to relax and take a nap on the couch during the afternoon.

To understand the meaning of a word in a specific context, it is essential to consider the surrounding words and sentences rather than looking up the general definition of the word. Context plays a crucial role in determining the intended meaning of words.