Recently, I came across this word: 正規品{せいきひん}

None of online dictionaries that I know had registered the term at all. I could not find such word in search result of jisho.org or search result of dictionary.goo.nee.jp, for example. Also, none of physical dictionaries that I have had anything to do with the term.

I found this Windows support page in Japanese that contain the term (in bold):

Windows の使用中に「正規品ではありません」のメッセージが表示される場合の対処方法

That is similar to this Windows support page in English that describes the well known message "Windows is not Genuine". Based on this, I am aware that 正規品 could mean 'genuine'.

But when I reverse look up the word 'genuine' in English-Japanese dictionary, the term 正規品 was not suggested. Without notable reference, this definition is not trustworthy.

Another clue I have is that the Japanese input method (Mozc) that I am using, was able to suggest 正規品 when I start typing せいき, despite there are many words that begin with 正規, which mostly translates to 'regular' or 'normal'. That has nothing to do with 'genuine'.

So what does 正規品 mean, really?

I am looking for an answer that can explain the meaning, as well as the usage of this word i.e. whether 正規品 is a technical term in some fields, abbreviation of a more complete term, or something else that I may have missed.


Based on this Q&A:


正規品 is another way of saying 本物. If you look at the Jisho definition of 正規, you'll see that one of the meanings is "legitimate." So 正規品 are legitimate goods, rather than a knockoff or a pirated copy. "Genuine" is another reasonable definition.

  • The linked Q&A at Yahoo! Japan has the definition suggested with respect to the word usage at auction site. While the answer may be correct, there is no explanation on how the definition may differ when used in different context as hinted by someone else. – clearkimura Jan 30 '18 at 14:43
  • Clearkimura-san, it sounds like you’re looking for an “official” definition of this word, but when I googled it I didn’t find any extensive dictionary definitions, just lots of common usage. Sometimes there isn’t any better way to understand a word’s meaning than to look at how it’s used. 品 is a common suffix that attaches easily to nouns and nominal adjectives. Is there a particular sphere of usage where you suspect this word might have a meaning other than the one I offered? – mamster Jan 30 '18 at 15:43

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