Why do we use the word "concent (コンセント)" as the meaning of "outlet?"

• "Concent" is one of the most confusing Japanese-English words, which means "outlet."
• "Concent" is one of the most confusing Japanese-English (or: "Engrish") words, which means "outlet". (or: wall outlet)

• There are other hypotheses, such as that it was derived from "consent."
• There are other hypotheses, such as that it was derived from (the word) "consent."

Interesting!

• "Concent" is one of the most confusing Japanese-English words, which means "outlet."
• This sentence is perfect! No correction needed!

• I think almost all American don't know the meaning of "concent" as "outlet," while most Japanese don't know the meaning of "outlet."
• I think almost all Americans do not associate the word "concent" to "outlet," while most Japanese don't know the meaning of "outlet."

• Today, I'd like to introduce why "concent" came to be used for “outlet” in Japan.
• Today, I'd like to introduce how "concent" came to be used for the word “outlet” in Japan.

• About 100 years ago in Europe, outlets (sockets) that the one pole is in the center, the other pole surrounding the center had been used.
• About 100 years ago in Europe, outlets (sockets) that had one pole in the center and another circular pole surrounding it.

  I'm not sure how to describe this well.

• When the outlet was imported into Japan, Japanese gave it the name of "concentric plug" from the shape.
• When the outlet was imported into Japan, Japanese named it "concentric plug" due to its circular(?) shape.

• Afterward, the word "concentric plug" had been divided into "concent" and "plug," the meaning of "concent" became "outlet" of "plug."
• Afterward, The words "concentric plug" was then further divided into "concent" and "plug," with the term "concent" taking up the meaning of "outlet" of "plug."

• Actually this story is one of the leading hypothesis.
• This story is one of many hypotheses that explains how the word "concent" actually came about.

• There are other hypotheses, such as that it was derived from "consent."
• There are other hypotheses, such as that it was derived from the word "consent."

• When will the truth be revealed?
• This sentence is perfect! No correction needed!

Interesting.. I always learn something new while correcting your entries!

• "Concent" is one of the most confusing Japanese-English words, which means "outlet."
• "Concent" is one of the most confusing English loanwords in Japanese. It means "outlet."

  The previous commenter suggested "Engrish," which is a way people refer to Japanese (and other Asian countries, particularly China) mis-translations of English words (derived from the fact that Japanese people often have trouble distinguishing "l" and "r."
  
  However! I think that using "Engrish" is inappropriate here; this is not Japanese being translated into English, but rather a real Japanese word derived from English. "English loanword" is a more appropriate description. English loanwords: ビール、ミルク、ドーアなど。German loanwords:　アルバイトなど。French loanwords: アベックなど。Engrish: "Please don't step on the asleep grasses." "
  
  A final note: As with any word that touches on cultural differences, I think "Engrish" has the potential to be used for good or evil. A westerner with ill-will toward Japan could refer to "Engrish" as a mean-spirited way to make fun of Japanese struggles with learning English. A westerner who likes Japan could use the word "Engrish" to light-heartedly joke about humorous Japanese mistranslations. A Japanese person (like yourself) could use it in self-deprecating humor.

• I think almost all American don't know the meaning of "concent" as "outlet," while most Japanese don't know the meaning of "outlet."
• I think almost no Americans don't know that meaning of "concent" means "outlet," and most Japanese don't know the meaning of "outlet."

• Today, I'd like to introduce why "concent" came to be used for “outlet” in Japan.
• Today, I'd like to explain why "concent" came to be used for “outlet” in Japan.

  Introduce is also good, but less frequently used int his context. Most people would say "explain."

• About 100 years ago in Europe, outlets (sockets) that the one pole is in the center, the other pole surrounding the center had been used.
• About 100 years ago Europe used sockets with one pole in the center, with another pole surrounding the center pole.

  I looked at your translation, but I don't really know what "pole" means in this context. Maybe "prong?"

• When the outlet was imported into Japan, Japanese gave it the name of "concentric plug" from the shape.
• When the outlet was imported into Japan, the Japanese gave it the name of "concentric plug" from the shape.

• Afterward, the word "concentric plug" had been divided into "concent" and "plug," the meaning of "concent" became "outlet" of "plug."
• Afterward, the word "concentric plug" was divided into "concent" and "plug," and "concent" came to mean the "outlet" of the "plug."

  (Changed it to slightly more closely follow your translation.

• Actually this story is one of the leading hypothesis.
• Actually, this story is one of the leading hypothesis.

• There are other hypotheses, such as that it was derived from "consent."
• This sentence is perfect! No correction needed!

• When will the truth be revealed?
• I wonder when will the truth will be revealed?

  (To more closely match up with... 何々でしょうか？)
  
  To use "will" in the place you did, you need to make it a question: "I wonder, when will the truth be revealed?"

Interesting! I don't think I would have guessed this. I would have just been puzzled at why Japanese people called plugs "consents."

Whenever I see a word written in かたかな, I always try to sound it out and see if it came from an English word! Sometimes, like with アベック or パン, there's no English word because it's a loanword from another country. I have noticed, though, that sometimes かたかな is used even when the word is a native Japanese word... a lot of animal names, for example, are often written in かたかな。クルマエビ•車海老、ネコ・猫など。I wonder why!