Hi I agree that it isn't clear. I think the writer means the third definition that they have given in the previous paragraph ... 1) to know, have power to, be able 2) to have carnal knowledge 3) to be mentally able, to have learned So, from the third sense, to have learned something is to know how to do something or know the fact and, in a similar way, the word can also be used in the phrase "to know someone" - to be acquainted with them The "gno" syllable is interesting.
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kenkenken9876Learning etymology is always very interesting and excitingI agree. Part of the fun of studying Old English and Middle English texts lies in seeing how some words have come down to us and some have not, and how the survivors have changed along the way.