Current Events > CE Word of the day - sound

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After scanning CE for interesting words for over two years I have been impressed with the level of intelligence of many of the people that post regularly. Sometimes an interesting word stands out, and other times it takes a while to find something that can be considered interesting. Considering the source it is not unusual to have a word that was used as a word of the day previously. At times the word of the day is found in an article that is quoted or other quoted source. If you see an interesting word being used on CE please mention me in the topic.

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Today's word is sound.
As defined by Merriam-Webster:
https://www.merriam-webster.com/dictionary/sound

Did You Know?

Noun (1)

English contains several sound homographs, all with distinct histories. For example, the sound that means "something heard" descends from Latin sonus ("sound"), whereas the sound that means "to measure the depth of water" traces to Old French sonde ("sounding line"). Another sound, however, is the contemporary form of Old English's gesund. Gesund is related to several words in other languages, such as Old Saxon gisund ("sound"), Old Frisian sund ("fresh, unharmed, healthy"), and Gothic swinths ("sound" or "healthy"). Another relative is Old High German's gisunt ("healthy"), which led to modern German's gesund, the root of gesundheit.

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Sound also refers to argument which is both valid (that is, logically consistent) and true (that is, its propositions are accurate).

For example:

All cars are dogs
All dogs are missiles
Therefore, all cars are missiles

The above argument is valid, because supposing that its propositions are accurate, the conclusion is as well. But it's not sound, because the propositions are not accurate.

All apples are fruits
All fruits have seeds
Therefore, all apples have seeds

But this argument is sound.

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